Whole-house dehumidifier installation in Southern Maryland costs $1,700 to $4,600 for most homeowners in 2026, with the national average landing around $3,000 installed. The total depends on the unit's capacity (measured in pints per day), whether it integrates into your existing HVAC ductwork or operates as a standalone system, and the complexity of the drainage and electrical work. A basic 70-pint unit with gravity drainage in an accessible mechanical room can be installed for as little as $1,200 to $1,800, while a high-capacity 150-pint system with dedicated ductwork, a condensate pump, and fresh air ventilation in a difficult-to-access crawlspace or attic runs $3,500 to $6,700 or more. Most homeowners in Calvert, St. Mary's, and Charles County land in the $2,000 to $3,500 range for a properly sized system that keeps their home's relative humidity between the 40 to 50 percent sweet spot year-round.
If there is one home improvement that pays for itself faster in Southern Maryland than almost anywhere else in the country, it is whole-house dehumidification. The Chesapeake Bay region's humid subtropical climate pushes outdoor relative humidity above 80 percent for much of the year, from late April through October, and frequently during warm spells in the shoulder months. Homeowners in Solomons, Chesapeake Beach, North Beach, and the waterfront communities along the Patuxent and Potomac Rivers live in some of the most consistently humid conditions on the East Coast. That moisture does not stay outside. It infiltrates every home through every crack, gap, and ventilation opening, condensing on cold surfaces, saturating building materials, feeding mold colonies, and creating the clammy, heavy indoor environment that every Southern Maryland homeowner recognizes in July and August. A central air conditioning system removes some moisture as a byproduct of cooling, but it was not designed to be a dehumidifier, it cycles off when the thermostat is satisfied, regardless of the humidity level, and it does nothing at all during the mild, humid days of spring and fall when cooling is unnecessary but humidity is still high. A whole-house dehumidifier operates independently of the temperature setting, pulling moisture from the air until the target humidity level is reached, and it does so for the entire home through the ductwork rather than one room at a time.
This guide covers every system type, their equipment and installed costs, ongoing operating expenses, and the specific regional factors that make whole-house dehumidification not just a comfort upgrade but a structural protection investment for homes in the tri-county area.
Cost by Unit Capacity
The capacity of a whole-house dehumidifier is measured in pints per day (PPD), the number of pints of water the unit can extract from the air in a 24-hour period under standard test conditions. Larger homes and higher humidity levels require higher-capacity units.
| Capacity (PPD) | Home Coverage | Equipment Cost | Installed Cost | Best For |
|---|---|---|---|---|
| 70 to 90 pints | 1,000 to 2,300 sq ft | $700 to $1,500 | $1,200 to $2,500 | Smaller ranchers and townhouses. Adequate for moderate humidity in well-sealed homes. |
| 100 to 120 pints | 2,300 to 3,000 sq ft | $1,000 to $2,000 | $1,800 to $3,200 | Mid-size colonials and split-levels. The most common size for Southern Maryland homes. |
| 130 to 150 pints | 3,000 to 3,500 sq ft | $1,500 to $2,400 | $2,500 to $4,100 | Larger homes with open floor plans, high ceilings, or multiple levels. |
| 160 to 200+ pints | 3,500 to 4,500+ sq ft | $2,000 to $2,800 | $3,000 to $4,600+ | Large custom homes, waterfront properties, or homes with severe moisture problems. |
Sizing is not just about square footage. Two homes with identical floor plans can have dramatically different dehumidification needs depending on their construction, location, and condition. A 2,500-square-foot colonial in Waldorf that was built in 2015 with a sealed crawlspace, spray foam insulation, and modern windows may do well with an 80-pint unit. The same floor plan in a 1985-built home in Leonardtown with an open crawlspace, fiberglass batts, and original single-pane windows may overwhelm a 120-pint unit because the moisture infiltration rate is three to five times higher. A proper load calculation, considering square footage, ceiling height, number of occupants, building tightness, crawlspace or basement condition, and local climate data, is the only reliable way to determine the right capacity.
Oversizing is less of a problem than undersizing. An oversized unit runs shorter cycles and reaches the target humidity faster, which increases energy efficiency. An undersized unit runs continuously, never reaches the target, and wears out prematurely. When the calculation falls between two capacities, go up.
Cost by System Type
Beyond capacity, the type of dehumidifier system affects both the installed cost and the performance characteristics.
| System Type | Installed Cost | How It Works |
|---|---|---|
| Ducted whole-house (integrated with HVAC) | $1,800 to $4,600 | Installed in the HVAC ductwork, treating all air as it circulates through the system. Shares the existing supply and return ducts. The most common and generally most effective configuration. |
| Standalone whole-house (dedicated unit) | $1,500 to $3,500 | A self-contained unit with its own intake and exhaust, installed in the basement, crawlspace, or mechanical room. Does not connect to the HVAC ductwork. Simpler installation but treats a more limited area. |
| Crawlspace dehumidifier | $1,200 to $2,800 | A sealed, corrosion-resistant unit designed specifically for the harsh crawlspace environment. Treats only the crawlspace air. Often paired with crawlspace encapsulation. |
| Ventilating dehumidifier | $2,500 to $5,500 | Combines dehumidification with fresh air ventilation, bringing in controlled outdoor air, filtering it, dehumidifying it, and distributing it through the ductwork. The premium option for tight, energy-efficient homes. |
The ducted whole-house system is the right choice for most Southern Maryland homes. It leverages the existing HVAC ductwork to treat air throughout the entire house, operates in coordination with the air conditioning system (the dehumidifier handles humidity while the AC handles temperature, each doing what it was designed to do), and is controlled by a single humidistat mounted in a central location. Installation requires connecting the unit to the return and supply ducts, running a condensate drain line, and providing an electrical connection, work that an HVAC technician can typically complete in 4 to 8 hours.
A standalone crawlspace dehumidifier is the right choice when the moisture problem is isolated to the crawlspace and the living space above stays comfortable. This is common in homes that have had crawlspace encapsulation (vapor barrier, sealed vents, insulated walls), the encapsulation stops bulk moisture intrusion, and the dehumidifier handles the residual moisture within the sealed space. The unit is smaller, less expensive, and simpler to install because it does not connect to the HVAC system. However, it only treats the crawlspace air, not the living space, so if humidity is elevated throughout the home, a crawlspace unit alone will not solve the problem.
Equipment Cost vs. Installed Cost Breakdown
Understanding the components of the installed cost helps you evaluate contractor quotes and identify where your money is going.
| Cost Component | Typical Range | What It Covers |
|---|---|---|
| Equipment (dehumidifier unit) | $700 to $2,800 | The dehumidifier itself, including compressor, coils, fan, controls, and housing. Varies by capacity, brand, and features. |
| Installation labor | $500 to $2,000 | Professional installation by a licensed HVAC technician at $75 to $150 per hour. A typical installation takes 4 to 8 hours depending on the system type and installation location. |
| Ductwork modifications | $200 to $600 | Sheet metal transitions, adapters, plenums, and connections to integrate the unit into the existing HVAC ductwork. |
| Drainage setup | $100 to $600 | Gravity drain line to a floor drain or sump pit ($50 to $150), or a condensate pump for locations without gravity drainage ($120 to $350 installed), or hard-plumbed connection to a waste line ($200 to $600). |
| Electrical work | $150 to $500 | Dedicated 120-volt or 240-volt circuit from the panel to the installation location, including wire, breaker, and outlet. Some units plug into an existing outlet if one is nearby. |
| Fresh air ductwork (if applicable) | $300 to $700 | Insulated duct from an exterior wall penetration to the dehumidifier's fresh air intake. Required only for ventilating dehumidifiers. |
The drainage method is a bigger cost variable than most homeowners expect. A whole-house dehumidifier can extract 70 to 200 pints of water per day, that is 8 to 25 gallons of water that has to go somewhere. The cheapest option is gravity drainage: a PVC line from the unit to a nearby floor drain, sump pit, or exterior exit point, costing $50 to $150 in materials and labor. If the unit is installed above the nearest drain point, in an attic, on a shelf in a mechanical room, or in a crawlspace without a sump, a condensate pump is required to lift the water to the drain, adding $120 to $350 to the project. Hard-plumbing the condensate line directly into the home's waste plumbing is the most reliable option (no pump to fail, no reservoir to overflow) but requires a licensed plumber and adds $200 to $600. For waterfront homes in Calvert County where the water table is high and crawlspace drainage is complicated, the drainage component alone can be the difference between a $2,000 installation and a $3,000 one.
Ongoing Costs
A whole-house dehumidifier has meaningful ongoing costs that should factor into the purchase decision and the household budget.
| Ongoing Cost | Amount | Frequency |
|---|---|---|
| Electricity | $210 to $680 per year ($25 to $80/month) | Continuous during humid months, reduced in winter |
| Filter replacement | $15 to $40 per filter | Every 3 to 6 months |
| Condensate drain cleaning | $0 to $100 | Annually (DIY or professional) |
| Professional inspection and coil cleaning | $100 to $200 | Every 1 to 2 years |
| Condensate pump replacement (if applicable) | $80 to $200 | Every 5 to 10 years |
Electricity is the largest ongoing cost, and it varies significantly based on the unit's capacity, the severity of the humidity, and how many hours per day the unit runs. In Southern Maryland's climate, a whole-house dehumidifier runs heavily from May through September, often 12 to 18 hours per day during the peak of summer, and lightly or not at all from November through March. At SMECO's residential electricity rate, a 90-pint unit running an average of 10 hours per day during the seven-month humid season costs approximately $300 to $450 per year in electricity. A 150-pint unit or one in a particularly moisture-laden environment costs more. High-efficiency units with Energy Star certification use 15 to 25 percent less electricity than standard models, making the efficiency rating a meaningful factor in the 10 to 15 year total cost of ownership.
Filter maintenance is simple and inexpensive but critical. The filter catches dust, pet dander, and debris before they reach the evaporator coil. A clogged filter restricts airflow, reduces dehumidification capacity, increases energy consumption, and can cause the coil to freeze, a repair that costs $200 to $500. Replacement filters cost $15 to $40 and the homeowner can change them in under a minute. Neglecting filters is the single most common cause of premature dehumidifier failure.
The 10-year total cost of ownership, including purchase, installation, electricity, filters, and periodic maintenance, runs approximately $4,000 to $10,000 for a typical Southern Maryland installation. That is $400 to $1,000 per year for whole-house humidity control, mold prevention, and structural protection. Given that a single mold remediation project costs $1,500 to $9,000 and moisture-damaged flooring, drywall, and framing can cost far more, the dehumidifier pays for itself the first time it prevents a moisture event.
When Your Home Needs a Whole-House Dehumidifier
Not every home in Southern Maryland needs a whole-house dehumidifier, but many do, and the signs are often so gradual that homeowners adapt to them rather than recognizing them as fixable problems.
Persistent Indoor Humidity Above 55 Percent
The target indoor relative humidity for comfort and health is 40 to 50 percent. Above 55 percent, the air feels clammy and heavy. Above 60 percent, conditions favor dust mite reproduction, mold growth, and bacterial proliferation. A simple hygrometer (a humidity gauge, available for $10 to $20 at any hardware store) placed in the living area tells you exactly where your home stands. If it consistently reads above 55 percent during the warmer months, even with the air conditioning running, your AC system is not removing enough moisture, and a dehumidifier is the solution.
Many homeowners in Prince Frederick, Dunkirk, Huntingtown, and the inland areas of Calvert County set their thermostats lower and lower trying to combat humidity, running the AC harder and paying higher electricity bills without actually solving the problem. The AC removes moisture only as a side effect of cooling; once the thermostat is satisfied, the system shuts off regardless of humidity. A dehumidifier operates on humidity, not temperature, and it continues removing moisture whether the AC is running or not.
Condensation on Windows and Surfaces
Water droplets forming on the inside of windows, mirrors fogging in rooms that are not bathrooms, and damp or clammy surfaces on walls, floors, or furniture are visible evidence that the indoor humidity is too high. In summer, this condensation occurs when warm, humid indoor air contacts a cold surface (typically a window cooled by the air conditioning). In winter, it occurs when indoor moisture condenses on cold window glass. Either way, it means the air holds more moisture than it should, and that moisture is depositing on surfaces throughout the home, including surfaces you cannot see, like the inside of wall cavities, the underside of roof sheathing, and the backside of drywall.
Musty Odors
The musty smell that Southern Maryland homeowners often associate with basements, crawlspaces, and closed-up rooms is the smell of mold and mildew growth. Active mold produces volatile organic compounds (MVOCs) that create that distinctive earthy, stale odor. If your home or specific rooms have a persistent musty smell, particularly after the house has been closed up, it is a strong indicator that moisture levels are elevated enough to support mold growth. A whole-house dehumidifier reduces the humidity below the threshold where mold can grow (below 50 percent relative humidity), addressing the root cause rather than masking the odor with air fresheners.
Visible Mold Growth
If you can see mold, on bathroom ceilings, around windows, on basement walls, on closet walls against exterior surfaces, or in the crawlspace, the humidity problem is already advanced. Surface mold is the visible portion of a colony that extends behind the surface, and it indicates that conditions have been humid enough for long enough that mold has established itself. While mold remediation addresses the existing growth, a whole-house dehumidifier prevents recurrence by maintaining humidity levels below the threshold for mold colonization.
Wood Floors Cupping, Doors Sticking, or Drawers Swelling
Wood absorbs and releases moisture in response to the ambient humidity. When indoor humidity is consistently high, wood floors absorb moisture from below (particularly over a damp crawlspace) and cup, the edges of each board rise higher than the center, creating a wavy surface. Interior doors swell and stick in their frames. Drawers become difficult to open and close. Trim joints open and close seasonally. These are not signs of defective materials or poor installation, they are signs that the indoor humidity is cycling through too wide a range. A whole-house dehumidifier stabilizes the indoor environment, keeping humidity within the narrow band (40 to 50 percent) where wood maintains a consistent moisture content and dimensional stability.
Regional Factors for Southern Maryland
Southern Maryland's geography, climate, and building practices create dehumidification challenges that are more severe than what homeowners in most other parts of the country face. Understanding these factors helps you size the right system and anticipate what your installation will involve.
The Chesapeake Bay Effect
The Chesapeake Bay and its tributaries, the Patuxent River, the Potomac River, and the dozens of creeks and inlets that define the coastline of Calvert, St. Mary's, and Charles County, moderate temperatures and elevate humidity throughout the region. Water bodies release moisture into the air through evaporation, and the prevailing winds carry that moisture-laden air inland. Waterfront and near-waterfront homes in Solomons, Chesapeake Beach, North Beach, St. Leonard, Lusby, Hollywood, Ridge, and the communities along the Potomac from Indian Head to Point Lookout experience the highest ambient humidity levels in the region, often 10 to 15 percentage points higher than inland locations on the same day. These homes need higher-capacity dehumidifiers (typically 100 to 150+ PPD rather than 70 to 90 PPD) and their dehumidifiers run more hours per day and more months per year than identical systems in homes further from the water.
Crawlspace Construction
A disproportionate share of homes in the tri-county area are built over crawlspaces rather than full basements, particularly in St. Mary's County, the waterfront areas of Calvert County, and the lower-elevation zones throughout the region where high water tables make basements impractical or prohibitively expensive. An unencapsulated crawlspace, vented to the outside, with exposed dirt or a thin vapor barrier over the ground, is a continuous moisture source. Ground moisture evaporates into the crawlspace air, outdoor humidity enters through the vents (especially in summer, when the code-required ventilation is working against you by bringing hot, humid air into a cooler space where it condenses), and that moisture migrates upward into the living space through the floor system. In many Southern Maryland homes, the crawlspace is responsible for 40 to 60 percent of the total moisture load inside the house.
The ideal solution is crawlspace encapsulation, sealing the vents, installing a heavy-gauge vapor barrier over the ground and up the walls, insulating the perimeter, and placing a dehumidifier in the sealed space, typically costing $5,000 to $15,000 for a complete installation. For homeowners who are not ready for the full encapsulation investment, a crawlspace dehumidifier installed in the existing crawlspace ($1,200 to $2,800) provides meaningful moisture reduction and mold prevention as an interim measure.
Seasonal Humidity Patterns
Southern Maryland's humid season is long. Indoor humidity problems typically begin in late April or early May, when outdoor dew points climb above 55°F, and persist through October. The worst months are July and August, when outdoor dew points regularly exceed 70°F, at which point the outdoor air itself contains more moisture than a comfortable indoor environment should hold, and every window opening, door swing, and air leak brings more moisture inside. But the shoulder months, May, June, September, and October, are where the dehumidifier earns its keep most visibly, because these are the months when the air conditioning runs less frequently or not at all, meaning the AC's incidental dehumidification is absent. Homeowners who turn off their AC in late September or October and open windows for the pleasant fall weather often see their indoor humidity spike into the 65 to 75 percent range within days, creating ideal mold conditions in a home that was comfortable all summer.
A whole-house dehumidifier solves this because it operates on humidity, not temperature. It runs whenever the humidity exceeds the set point, regardless of whether the AC is on or off, whether the windows are open or closed, and whether it is July or October. For the extended shoulder season that Southern Maryland's climate produces, this continuous humidity control is the feature that justifies the investment.
Older Homes and Leaky Building Envelopes
The established neighborhoods throughout the tri-county area, the older communities in Leonardtown, Mechanicsville, Charlotte Hall, La Plata, Hughesville, and Indian Head, include a substantial inventory of homes built in the 1960s, 1970s, and 1980s with building practices that are far less air-tight than modern construction. Single-pane windows, uninsulated rim joists, minimal weatherstripping, ductwork in unconditioned spaces, and balloon-frame construction that creates continuous air pathways from the crawlspace to the attic all increase the rate at which outdoor humidity infiltrates the home. These homes have higher moisture loads and need larger dehumidifiers (stepping up one capacity tier from what the square footage alone would suggest) because the building envelope is simply leakier than a modern home of the same size.
New Construction in the Growth Corridors
The expanding residential developments along the Route 5 corridor through Hughesville and Charlotte Hall, the subdivisions around Lexington Park and California, and the continued growth in the Waldorf, White Plains, and Brandywine areas produce homes that are tighter and better insulated than older construction, but that tightness creates its own humidity challenge. A well-sealed home traps indoor-generated moisture (cooking, bathing, breathing, laundry) that older, leakier homes allowed to escape through infiltration. New construction also produces significant moisture during the first one to three years as concrete, drywall joint compound, paint, and lumber release the water used in their manufacture. A whole-house dehumidifier in new construction addresses both the trapped moisture and the construction moisture, protecting both the occupants and the new building materials from humidity damage during the critical first years.
DIY vs. Professional Installation
What a DIY Installer Can Do
A standalone crawlspace dehumidifier with gravity drainage is the most feasible DIY installation. The unit sits on the crawlspace floor or on a platform, plugs into a standard outlet, and drains through a PVC line to a sump pit or exterior exit. If the crawlspace has electrical service and a drainage path, a handy homeowner can set up the unit in 2 to 4 hours, saving $300 to $600 in labor. The equipment cost alone for a quality 70-pint crawlspace dehumidifier with a built-in pump runs $700 to $1,200.
The critical requirement for a DIY crawlspace installation is that the crawlspace must be safely accessible, adequately supported (you will be placing a 65 to 100 pound unit on the ground or a shelf), and have electrical service rated for the unit's draw (typically 5 to 8 amps on a 120-volt circuit). If the crawlspace lacks an outlet, hiring an electrician to install a dedicated circuit ($150 to $400) before you install the unit yourself is the smart approach.
What Requires Professional Installation
A ducted whole-house dehumidifier integrated into the HVAC system should be installed by a licensed HVAC technician. The installation requires cutting into the HVAC ductwork, fabricating sheet metal connections, balancing the airflow between the dehumidifier and the existing system, installing the condensate drainage, and connecting or installing electrical service. An improperly connected unit can restrict airflow through the HVAC system (reducing cooling and heating efficiency), create condensate leaks in the ductwork (causing the very moisture damage the dehumidifier was meant to prevent), or draw air from the wrong location and dehumidify ineffectively.
A ventilating dehumidifier is the most complex installation because it requires an exterior wall penetration for the fresh air intake, insulated ductwork from the penetration to the unit, and careful configuration of the fresh air damper and control system. This installation affects the home's pressure balance and ventilation rate and should be designed and installed by a professional who understands building science, not just ductwork fabrication.
The labor cost of professional installation, $500 to $2,000, is a small fraction of the total investment in a system that will run for 10 to 15 years, protecting a home worth $300,000 to $600,000 or more from moisture damage. The consequences of an improperly installed system, water damage from condensate leaks, mold growth from inadequate dehumidification, HVAC efficiency loss from airflow restriction, can each individually cost more than the entire professional installation.
Choosing the Right System for Your Home
For homeowners in the tri-county area, the decision framework is relatively straightforward once you understand your home's specific situation.
If your humidity problem is limited to the crawlspace, the crawlspace is damp, musty, or showing mold, but the living space above stays comfortable, a standalone crawlspace dehumidifier at $1,200 to $2,800 installed is the appropriate solution, ideally paired with crawlspace encapsulation for maximum effectiveness.
If your entire home feels humid, clammy air, condensation on windows, musty odors in multiple rooms, the AC running constantly without controlling humidity, a ducted whole-house dehumidifier integrated into your HVAC system at $1,800 to $4,600 installed is the right investment. Size it based on a professional load calculation, not just square footage.
If your home is new construction or a tight, energy-efficient renovation and you want to control both humidity and ventilation, a ventilating dehumidifier at $2,500 to $5,500 installed provides the most complete solution, managing moisture while also bringing in filtered, dehumidified fresh air to maintain indoor air quality in a home that does not breathe much on its own.
If you are planning crawlspace encapsulation, budget for a crawlspace dehumidifier as part of that project, encapsulation without dehumidification leaves the sealed space relying on HVAC conditioning to manage moisture, which is less reliable and less effective than a dedicated unit.
Frequently Asked Questions
How much does a whole-house dehumidifier cost to install in Southern Maryland? Most homeowners in Calvert, St. Mary's, and Charles County pay $1,700 to $4,600 installed for a whole-house dehumidifier in 2026, with the average around $3,000. The total depends on unit capacity (70 to 200 pints per day), system type (ducted, standalone, or crawlspace), and installation complexity. Equipment costs range from $700 to $2,800, labor runs $500 to $2,000, and additional costs for ductwork, drainage, and electrical work add $250 to $1,800 depending on the home's configuration.
What size whole-house dehumidifier do I need? The right size depends on your home's square footage, construction tightness, moisture sources, and location. As a general guide, 70 to 90 pints per day covers 1,000 to 2,300 square feet, 100 to 120 pints covers 2,300 to 3,000 square feet, and 130 to 150+ pints covers 3,000 to 3,500+ square feet. Waterfront homes, homes with open crawlspaces, and older homes with leaky building envelopes should size up one tier from what the square footage alone would suggest. A professional load calculation is the most reliable way to determine the right capacity.
How much does it cost to run a whole-house dehumidifier? Electricity costs run $210 to $680 per year depending on the unit's capacity and how many hours per day it runs. In Southern Maryland's climate, expect the unit to run heavily from May through September and lightly or not at all in winter. At SMECO rates, that works out to $25 to $80 per month during the humid season and less during the rest of the year. Annual maintenance (filters, drain cleaning, periodic inspection) adds approximately $100 to $300 per year.
Will a whole-house dehumidifier help with mold? Yes, controlling indoor humidity below 50 percent eliminates the conditions that mold needs to grow. A whole-house dehumidifier does not remove existing mold (that requires mold remediation, typically $1,500 to $9,000), but it prevents new mold growth and recurrence after remediation by maintaining humidity levels below the threshold for mold colonization. In Southern Maryland's humid climate, a dehumidifier is one of the most effective long-term mold prevention investments a homeowner can make.
Can a whole-house dehumidifier work with my existing HVAC system? Yes. A ducted whole-house dehumidifier integrates into HVAC systems of virtually any age, brand, and configuration. The unit connects to the existing return and supply ductwork and operates independently of the heating and cooling equipment. It works alongside the HVAC system, the AC handles temperature, the dehumidifier handles humidity, each doing the job it was designed for. The only compatibility consideration is that the ductwork must be in reasonable condition and properly sized; if the existing ducts are undersized, leaky, or deteriorated, those issues should be addressed before or during the dehumidifier installation.
Is a whole-house dehumidifier worth it in Southern Maryland? For most homes in the tri-county area, yes. Southern Maryland's humidity levels are among the highest on the East Coast, and the moisture damage that uncontrolled humidity causes, mold growth, wood rot, flooring damage, musty odors, dust mite proliferation, and structural deterioration, is cumulative and expensive to repair. A whole-house dehumidifier at $1,700 to $4,600 installed with annual operating costs of $300 to $1,000 protects a home worth hundreds of thousands of dollars from moisture damage that can cost tens of thousands to remediate. The comfort improvement alone, eliminating the clammy, heavy indoor air that makes summer nights miserable even with the AC running, is significant enough that most homeowners consider the investment worthwhile within the first season.
What is the difference between a whole-house dehumidifier and a portable unit? A whole-house dehumidifier treats the entire home's air through the HVAC ductwork, operates automatically via a humidistat, drains continuously to a floor drain or sump, and is installed out of sight in the mechanical room or crawlspace. A portable unit treats only the room it is in (typically 300 to 700 square feet), requires manual emptying of a water reservoir every 8 to 24 hours (or a hose to a drain), produces noticeable fan noise in the living space, and must be moved from room to room to treat different areas. Achieving whole-home coverage with portable units in a 2,500-square-foot home would require four to six units at a combined cost of $800 to $2,400, with the hassle of emptying multiple reservoirs daily and the noise of multiple fans running in living spaces. The whole-house system does the same job with a single unit, no daily maintenance, and zero noise in the living areas.
Ready to take control of the humidity in your Southern Maryland home? Gray & Sons Contracting installs whole-house dehumidification systems throughout Calvert, St. Mary's, and Charles County, from ducted HVAC-integrated systems in Waldorf colonials and Huntingtown split-levels to crawlspace dehumidifiers in Solomons waterfront ranchers and Leonardtown farmhouses. Living on the Chesapeake Bay means living with humidity, but it does not mean living with mold, musty air, and clammy surfaces. We help you choose the right system for your home's specific moisture challenges, whether that is a waterfront location, an open crawlspace, an older building envelope, or all three, and we install it so it performs correctly from the first day. Get a Free Estimate