Choosing the correct dehumidifier can feel overwhelming, but it doesn’t have to be. This guide walks you through every step—from assessing your space to comparing models—so you can pick the perfect unit for your needs. You’ll save money, improve air quality, and protect your home from moisture damage.
Quick Answers to Common Questions
What size dehumidifier do I need for a 1,000 sq ft basement?
For a 1,000 sq ft basement that’s moderately damp, a 30–40 pint dehumidifier is usually sufficient. If it’s very damp or prone to flooding, go for a 50-pint model.
Can I run a dehumidifier all the time?
Yes, especially if you have continuous drainage. Many models are designed for 24/7 operation. Just make sure to clean the filter regularly.
Do dehumidifiers use a lot of electricity?
It depends on the model and usage. Energy Star-certified units are more efficient. On average, a 50-pint dehumidifier uses about 500–700 watts per hour.
Should I buy a dehumidifier with a pump?
If you’re using it in a basement without a floor drain, a built-in pump is worth the extra cost. It allows you to drain water upward to a sink or window.
How often should I clean the filter?
Clean the filter every 2–4 weeks, or more often if you have pets or high dust levels. A clean filter ensures better airflow and efficiency.
How to Choose the Correct Dehumidifier
Too much humidity in your home can lead to musty smells, peeling paint, warped wood, and even health issues like allergies or asthma. A dehumidifier helps by pulling excess moisture from the air, creating a healthier, more comfortable living environment. But with so many models on the market, how do you choose the correct dehumidifier?
This step-by-step guide will help you make an informed decision. You’ll learn how to assess your space, understand key features, compare types, and pick a unit that fits your lifestyle and budget. Whether you’re dealing with a damp basement, a humid bathroom, or just want better air quality, we’ve got you covered.
Step 1: Assess Your Space and Humidity Level
Before buying any dehumidifier, you need to understand the problem you’re solving. Start by evaluating the area where you plan to use the unit.
Visual guide about How to Choose the Correct Dehumidifier
Image source: hellomaman.fr
Measure the Square Footage
Grab a tape measure and calculate the length and width of the room. Multiply them to get the total square footage. For example, a 10 ft x 12 ft room is 120 square feet. Most dehumidifiers list their coverage area, so this number is essential for choosing the right size.
Determine the Humidity Level
Use a hygrometer—a small, inexpensive device that measures humidity—to check the moisture level in your space. Ideal indoor humidity is between 30% and 50%. If it’s higher, you likely need a dehumidifier.
Here’s a quick guide to humidity levels:
- Dry (below 30%): No dehumidifier needed. Consider a humidifier instead.
- Comfortable (30–50%): Ideal range. Monitor for changes.
- Moderately damp (50–60%): May need a small to medium dehumidifier.
- Very damp (60–70%): Requires a medium to large unit.
- Wet or flooded (above 70%): Needs a high-capacity dehumidifier, possibly with a pump.
Identify the Source of Moisture
Is the humidity coming from a leaky pipe, poor ventilation, or seasonal weather? Fixing the root cause is important, but a dehumidifier can help manage the symptoms while you address the issue.
Step 2: Choose the Right Type of Dehumidifier
Not all dehumidifiers work the same way. There are three main types: compressor, desiccant, and thermoelectric. Each has pros and cons depending on your climate and needs.
Compressor Dehumidifiers (Refrigerant)
These are the most common and affordable type. They use a refrigerant to cool air, causing moisture to condense and collect in a tank. Best for warm, humid environments (above 65°F).
Pros: High efficiency, great for large spaces, widely available.
Cons: Can be noisy, less effective in cold temperatures.
Desiccant Dehumidifiers
These use a moisture-absorbing material (like silica gel) to pull water from the air. They work well in cooler temperatures and are often quieter.
Pros: Effective in cold or low-humidity areas, quiet operation, compact.
Cons: Higher energy use, smaller capacity, more expensive.
Thermoelectric Dehumidifiers
These use a small fan and Peltier module to cool air and collect moisture. They’re tiny, quiet, and great for small spaces like closets or RVs.
Pros: Very quiet, energy-efficient, portable.
Cons: Low capacity, not suitable for large or very damp areas.
Tip: For most homes, a compressor dehumidifier is the best all-around choice. But if you live in a cold climate or need a quiet unit for a bedroom, consider a desiccant model.
Step 3: Match the Capacity to Your Needs
Dehumidifiers are rated by how many pints of moisture they can remove in 24 hours. This is called the “pint rating.” Choosing the right capacity is crucial—too small, and it won’t keep up; too large, and it may cycle on and off too often, wasting energy.
Use a Sizing Chart
Most manufacturers provide a sizing guide based on room size and humidity level. Here’s a simplified version:
- 10–25 pints: Small rooms (under 500 sq ft), slightly damp.
- 30–40 pints: Medium rooms (500–1,500 sq ft), moderately damp.
- 50–70 pints: Large rooms or basements (1,500–2,500 sq ft), very damp.
- 70+ pints: Whole-house or severely wet areas (flooding, high humidity).
Example: Choosing for a Basement
Let’s say you have a 1,200 sq ft basement that feels damp and smells musty. A hygrometer shows 65% humidity. Based on the chart, a 50-pint dehumidifier would be ideal. It can handle the size and moisture level without overworking.
Don’t Overbuy
Some people think “bigger is better,” but oversized units can short-cycle—turning on and off quickly—which reduces efficiency and lifespan. Stick to the recommended range for your space.
Step 4: Look for Key Features
Modern dehumidifiers come with a range of features that improve convenience, efficiency, and performance. Here’s what to look for.
Auto-Humidistat
This sensor measures humidity and automatically turns the unit on or off to maintain your desired level. No more guessing or constant adjustments.
Continuous Drainage Option
Instead of emptying a tank every few hours, you can attach a hose to drain water directly into a floor drain or sump pump. Essential for basements or 24/7 operation.
Built-in Pump
Some models include a pump that can push water upward (e.g., from a basement to a sink). This is a game-changer if you don’t have a floor drain nearby.
Washable or Replaceable Filters
Filters trap dust and allergens. Washable filters save money and reduce waste. Check how often they need cleaning—usually every 2–4 weeks.
Timer and Auto-Restart
A timer lets you schedule operation (e.g., run only at night). Auto-restart resumes settings after a power outage—great for storms or outages.
Quiet Operation
Look for models with noise levels below 50 decibels (dB). This is about the sound of a quiet conversation. Important for bedrooms or living areas.
Energy Efficiency
Choose an Energy Star-certified model. These use up to 30% less energy than standard units, saving you money on electricity bills.
Step 5: Consider Placement and Installation
Even the best dehumidifier won’t work well if it’s in the wrong spot. Proper placement ensures maximum airflow and efficiency.
Best Locations
- Basements: Near the center or where moisture is worst. Avoid corners with poor airflow.
- Laundry Rooms: Close to the dryer vent to capture humid air.
- Bathrooms: Use a small, quiet model if ventilation is poor.
- Whole-House Systems: Install in a central location, often connected to HVAC ducts.
Clearance and Airflow
Leave at least 6–12 inches of space around the unit for air intake and exhaust. Don’t block vents with furniture or walls.
Level Surface
Place the dehumidifier on a flat, stable surface. Tilting can cause water to spill or the unit to malfunction.
Step 6: Compare Brands and Read Reviews
Once you know what you need, it’s time to shop. Compare models from reputable brands like Frigidaire, Honeywell, GE, Midea, and AprilAire.
Check Customer Reviews
Look for feedback on reliability, noise, ease of use, and customer service. Pay attention to recurring complaints—like frequent breakdowns or poor drainage.
Warranty and Support
A good warranty (1–2 years) shows the manufacturer stands behind their product. Check if parts and labor are covered.
Price vs. Value
Don’t just go for the cheapest option. A slightly more expensive model with better features and efficiency may save you money in the long run.
Step 7: Maintain Your Dehumidifier
Regular maintenance keeps your dehumidifier running smoothly and extends its life.
Clean the Filter Monthly
Remove the filter and rinse it with warm water. Let it dry completely before reinserting. A clogged filter reduces airflow and efficiency.
Empty the Water Tank
If your model doesn’t have continuous drainage, empty the tank when it’s ¾ full. Most units have a “full” indicator light.
Wipe Down the Unit
Use a damp cloth to clean the exterior and vents. Avoid harsh chemicals that could damage the surface.
Check for Frost (Compressor Models)
In cold environments, ice can build up on the coils. If this happens, turn off the unit and let it defrost. Consider a model with auto-defrost.
Store Properly Off-Season
If you only use your dehumidifier in summer, clean it thoroughly and store it in a dry place. Cover it to prevent dust buildup.
Troubleshooting Common Issues
Even the best dehumidifiers can have problems. Here’s how to fix common issues.
Unit Won’t Turn On
- Check the power cord and outlet.
- Make sure the tank isn’t full (some models won’t start if the tank is full).
- Reset the circuit breaker if needed.
Not Removing Enough Moisture
- Clean the filter—clogged filters reduce performance.
- Ensure proper placement and airflow.
- Check if the room is too large or too wet for the unit’s capacity.
Water Leaking
- Make sure the tank is seated correctly.
- Check for cracks in the tank or hose.
- Ensure the unit is level.
Too Noisy
- Place the unit on a vibration-absorbing mat.
- Check for loose parts or debris in the fan.
- Move it to a less sensitive area if noise persists.
Conclusion
Choosing the correct dehumidifier doesn’t have to be complicated. By assessing your space, understanding humidity levels, and matching the right type and capacity to your needs, you can find a unit that keeps your home comfortable and healthy. Look for smart features like auto-humidistats and continuous drainage to make maintenance easier. And don’t forget to maintain your dehumidifier regularly to keep it running efficiently for years.
With the right dehumidifier, you’ll reduce mold risk, improve air quality, and protect your home from moisture damage. Take the time to choose wisely—your home (and your lungs) will thank you.