Walk into a Florida basement in July and you will swear it feels cooler after running a dehumidifier for an hour. So do dehumidifiers cool the air, or is your skin just playing tricks? The honest answer falls in the middle. A dehumidifier removes moisture but typically adds 1 to 3 degrees Fahrenheit of heat to the room, while the lower humidity makes you feel measurably cooler. After two decades of crawling through damp crawl spaces and finished basements, I have watched dozens of homeowners get this wrong and overspend on cooling equipment.
How a Dehumidifier Actually Works
Most residential units, including the Frigidaire FFAD5033W1 and the hOmeLabs HME020031N, use the same refrigerant cycle as a window air conditioner. Warm humid air passes over cold evaporator coils, water condenses out, then the dried air blows back through the warm condenser coils before exiting the unit. Because all that heat stays inside the room rather than venting outdoors, the net temperature actually rises slightly.
A 50-pint dehumidifier pulls roughly 6 amps at 115 volts, which translates to around 690 watts. Every one of those watts eventually becomes heat. Over an hour you add about 2,355 BTUs of warmth to a sealed room, enough to raise a 200-square-foot basement by a degree or two.
Why It Still Feels Cooler
Human comfort depends on the body’s ability to evaporate sweat. At 80 percent relative humidity, sweat barely evaporates, so 78 degrees feels miserable. Drop that humidity to 45 percent and the same 78 degrees feels pleasant. ASHRAE Standard 55, the comfort benchmark used by HVAC engineers, identifies a sweet spot of 68 to 75 degrees at 30 to 60 percent relative humidity. A dehumidifier moves you toward that target by attacking moisture rather than temperature.
The perceived cooling effect can be worth 4 to 6 degrees of apparent temperature, which is why standalone dehumidifiers feel almost magical in muggy basements where the thermometer barely budges.
Dehumidifier Versus Air Conditioner
A central AC also removes humidity, but only as a byproduct of cooling. If your home reaches the setpoint quickly on mild days, the AC short-cycles and humidity stays high. This is exactly the scenario where a standalone dehumidifier earns its keep. In a 1,800-square-foot ranch with a high-efficiency 14 SEER unit, summer indoor humidity often runs 60 to 65 percent. Adding a portable dehumidifier like the LG PuriCare 50-pint can drop that to 50 percent and finally make the thermostat readable.
Whole-house dehumidifiers from Aprilaire (Model 1850 around $1,400) and Honeywell (DR90 around $1,300) integrate with existing ductwork and pull 70 to 130 pints per day. Installation by an HVAC contractor typically runs $800 to $1,500 on top of the unit.
When a Dehumidifier Beats Running the AC
Spring and fall in the Mid-Atlantic and Midwest hit the sweet spot. Outdoor temperatures sit in the 60s and 70s, but humidity still climbs above 70 percent. Running the AC just to dry the air wastes energy and can chill the house uncomfortably. A 50-pint dehumidifier costs roughly 9 cents per hour to run at the national average of 16 cents per kilowatt-hour, while central AC easily burns 40 to 60 cents per hour.
Crawl spaces and unfinished basements also benefit. Both spaces typically stay 10 to 15 degrees cooler than the main floor, so cooling them further wastes energy. Pulling humidity from 75 percent down to 50 percent prevents mold growth on joists and stops that musty smell from migrating upstairs.
Energy Costs You Should Expect
The Department of Energy now requires Energy Star certified dehumidifiers to meet an Integrated Energy Factor of at least 1.30 liters per kilowatt-hour for portable units. Running a 50-pint unit 12 hours per day costs roughly $30 to $45 monthly in most regions. A whole-house unit running 8 hours per day adds around $25 monthly. Compare that to $150 to $250 monthly to keep central AC running just for humidity control, and the math becomes obvious.
Sizing the Right Unit
- Slightly damp 500-square-foot room: 20 to 25 pint unit, around $200 to $250
- Moderately damp 1,000-square-foot basement: 35 to 40 pint unit, around $250 to $320
- Wet 1,500-square-foot basement with visible moisture: 50 pint unit, around $300 to $400
- Whole-house ducted system for 2,500 square feet: 90 to 130 pint unit, $1,200 to $1,800 plus install
Pint ratings under the 2020 DOE standard run lower than older labels, so a current 50-pint unit roughly equals a pre-2020 70-pint unit.
Best Practices for Real Comfort
Set the target humidity to 45 to 50 percent. Going below 40 percent stresses wood floors and trim, while above 55 percent allows dust mites and mold to thrive. Empty the bucket daily or run a 5/8-inch garden hose to a floor drain for continuous operation. Clean the front intake filter monthly with a vacuum brush attachment; clogged filters cut capacity by 20 to 30 percent.
Position the unit at least 12 inches from walls for adequate airflow, and avoid putting it directly against carpet, which restricts the bottom vents on some models. In closed rooms, crack a door so dried air can circulate rather than recycling against the same wall.
Top Models for 2026
The Frigidaire FFAD5033W1 50-pint at around $260 is the most reliable mid-range pick, with Consumer Reports ranking it in the top three for the past four years. The hOmeLabs HME020031N 50-pint runs about $230 and offers continuous drainage with a built-in pump. For whole-house ducted applications, the Aprilaire 1850 at $1,400 ties into existing HVAC and delivers 95 pints daily.
For premium standalone use, the LG PuriCare 50-pint includes a fold-out handle, smart Wi-Fi controls, and an inverter compressor that ramps to load rather than cycling on and off. Inverter-driven units run quieter (around 47 dB at 6 feet) and consume 20 to 30 percent less energy than fixed-speed alternatives over a year of operation.
The Honest Answer
So do dehumidifiers cool the air? Technically no, they warm it slightly. Practically yes, they make you feel several degrees cooler and let your AC short-cycle less aggressively. For shoulder seasons, basements, and humid coastal homes, a dehumidifier delivers comfort that an oversized AC simply cannot match, at a fraction of the operating cost.
