Choosing the right dehumidifier can improve air quality, reduce mold, and save energy. This guide walks you through size, type, features, and placement to help you buy an efficient dehumidifier that fits your needs.
Quick Answers to Common Questions
Tip/Question?
How do I know if my dehumidifier is working efficiently?
Check the water tank regularly—if it’s filling as expected and humidity levels are dropping, it’s working. Use a hygrometer to monitor indoor humidity and ensure it stays between 30% and 50%.
Tip/Question?
Can I use a dehumidifier in winter?
Yes, but only if the space is above 40°F. Use a desiccant model in cold areas like garages. Avoid refrigerant units in freezing temperatures—they can freeze and stop working.
Tip/Question?
Should I run my dehumidifier all the time?
Not necessarily. Use the auto-humidistat to maintain your target level. In moderate climates, 8–12 hours a day may be enough. Continuous use is best for very damp areas.
Tip/Question?
Is a bigger dehumidifier always better?
No. An oversized unit cycles too quickly, wasting energy and not removing moisture effectively. Choose one matched to your space and humidity level.
Tip/Question?
Do dehumidifiers help with allergies?
Yes. By reducing mold, dust mites, and mildew, dehumidifiers can significantly improve indoor air quality and ease allergy symptoms.
How to Buy an Efficient Dehumidifier
High humidity isn’t just uncomfortable—it can lead to mold, musty odors, allergies, and even damage to your home. An efficient dehumidifier helps control moisture levels, improves indoor air quality, and protects your belongings. But with so many models on the market, how do you choose the right one?
In this guide, we’ll walk you through everything you need to know to buy an efficient dehumidifier. You’ll learn how to assess your needs, compare types and features, and make a smart purchase that saves energy and works effectively. Whether you’re tackling a damp basement, a humid bathroom, or a stuffy bedroom, this step-by-step guide will help you find the perfect fit.
Step 1: Understand Why You Need a Dehumidifier
Before shopping, it’s important to understand what a dehumidifier does and why you might need one. Dehumidifiers remove excess moisture from the air, helping maintain a healthy indoor humidity level—ideally between 30% and 50%.
Visual guide about How to Buy an Efficent Dehumidifier
Image source: dailyboats.com
Common Signs You Need a Dehumidifier
- Condensation on windows: Water droplets on glass indicate high indoor humidity.
- Musty smells: A damp, earthy odor often means mold or mildew is growing.
- Peeling paint or wallpaper: Moisture can cause finishes to bubble or peel.
- Allergies or respiratory issues: Dust mites and mold thrive in humid environments and can worsen symptoms.
- Warped wood or rust: Excess moisture damages furniture, floors, and metal fixtures.
If you’ve noticed any of these signs, a dehumidifier is likely a good investment. But not all dehumidifiers are created equal. The key is choosing one that’s efficient, effective, and suited to your specific space.
Step 2: Determine the Right Size and Capacity
One of the most common mistakes people make is buying a dehumidifier that’s too small—or too large—for their needs. Size matters when it comes to efficiency and performance.
Calculate the Square Footage
Start by measuring the area you want to dehumidify. Use a tape measure to find the length and width of the room, then multiply them to get the square footage. For example, a 10 ft x 12 ft room is 120 square feet.
Assess the Humidity Level
Next, determine how damp the space is. Most dehumidifiers are rated for different humidity conditions:
- Slightly damp: Feels humid, occasional musty smell. Ideal for bedrooms or living rooms.
- Moderately damp: Noticeable dampness, frequent odors. Common in basements or laundry rooms.
- Very damp: Visible moisture, standing water, strong mold smell. Found in flood-prone areas or poorly ventilated spaces.
- Wet: Water leaks, puddles, or flooding. Requires a heavy-duty unit or professional remediation.
Choose the Right Capacity (in Pints per Day)
Dehumidifiers are rated by how many pints of moisture they can remove in 24 hours. Here’s a general guide:
- Small (20–30 pints): Up to 500 sq ft, slightly damp areas.
- Medium (30–50 pints): 500–1,500 sq ft, moderately damp spaces.
- Large (50–70 pints): 1,500–2,500 sq ft, very damp or wet areas.
- Extra-large (70+ pints): Over 2,500 sq ft, commercial or severe moisture problems.
For example, a 700 sq ft basement with moderate dampness would need a 30–50 pint unit. Going slightly larger is okay, but avoid oversized models—they cycle on and off too quickly, wasting energy and reducing efficiency.
Step 3: Choose the Right Type of Dehumidifier
There are two main types of dehumidifiers: refrigerant (compressor) and desiccant. Each works differently and is better suited to certain environments.
Refrigerant (Compressor) Dehumidifiers
These are the most common and affordable type. They use a cold coil to condense moisture from the air, then reheat the air before releasing it. They work best in warm, humid conditions—typically above 65°F (18°C).
Best for: Living rooms, bedrooms, basements in warm climates.
Pros: Energy-efficient in warm temps, lower upfront cost, widely available.
Cons: Less effective in cold spaces, can freeze up below 60°F.
Desiccant Dehumidifiers
These use a moisture-absorbing material (like silica gel) to pull water from the air. They don’t rely on cold coils, so they perform well in cooler temperatures—down to 40°F (4°C).
Best for: Garages, crawl spaces, winterized cabins, or cold basements.
Pros: Effective in low temperatures, quieter operation, compact design.
Cons: Higher energy use, more expensive, may require periodic desiccant replacement.
If you live in a cold climate or need dehumidification in an unheated space, a desiccant model is likely the better choice. For most homes in temperate or warm regions, a refrigerant dehumidifier will be more efficient and cost-effective.
Step 4: Look for Energy Efficiency
An efficient dehumidifier doesn’t just remove moisture—it does so without driving up your electricity bill. Energy efficiency is crucial for long-term savings and environmental impact.
Check for ENERGY STAR Certification
Look for the ENERGY STAR label. These models meet strict energy efficiency guidelines set by the U.S. Environmental Protection Agency. ENERGY STAR dehumidifiers use 15–30% less energy than standard models.
Compare the Energy Factor (L/kWh)
The energy factor tells you how many liters of water the unit removes per kilowatt-hour of electricity. Higher is better. For example:
- 2.0 L/kWh = very efficient
- 1.5 L/kWh = average
- 1.0 L/kWh = less efficient
A model with a 2.5 L/kWh rating will save you money over time compared to one at 1.2 L/kWh, especially if you run it frequently.
Estimate Running Costs
To calculate monthly cost, use this formula:
Daily kWh = (Watts × Hours used per day) ÷ 1,000
Monthly cost = Daily kWh × 30 × Electricity rate ($/kWh)
For example, a 300-watt dehumidifier running 8 hours a day in a home with $0.12/kWh electricity:
- Daily kWh = (300 × 8) ÷ 1,000 = 2.4 kWh
- Monthly cost = 2.4 × 30 × 0.12 = $8.64
Choosing a more efficient model could cut this cost significantly.
Step 5: Evaluate Key Features
Modern dehumidifiers come with a range of features that improve convenience, performance, and efficiency. Here’s what to look for.
Auto-Humidistat
This sensor measures humidity and turns the unit on or off to maintain your desired level (e.g., 45%). It prevents over-drying and saves energy.
Adjustable Humidity Settings
Look for models with a digital display and humidity controls (usually in 5% increments). This lets you fine-tune the environment for comfort and efficiency.
Continuous Drainage Option
Instead of manually emptying a water tank, you can connect a hose to drain water directly into a floor drain or sump pump. This is ideal for basements or 24/7 operation.
Washable or Reusable Filters
Air filters trap dust and allergens. Washable filters save money and reduce waste. Check if the filter is easy to remove and clean.
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 storm-prone areas.
Quiet Operation
Noise levels are measured in decibels (dB). For quiet spaces like bedrooms, choose a model under 50 dB. Most efficient models range from 45–55 dB.
Portability and Design
Look for built-in handles, caster wheels, and a compact design if you plan to move the unit between rooms. A sleek, modern look may also matter for living areas.
Step 6: Consider Placement and Installation
Even the best dehumidifier won’t work efficiently if it’s poorly placed. Proper installation ensures optimal airflow and performance.
Choose the Right Location
Place the unit in the center of the room or near the source of moisture (e.g., basement stairs, laundry area). Avoid corners or tight spaces that restrict airflow.
Allow Space for Airflow
Keep at least 6–12 inches of clearance around the unit. Don’t block the intake or exhaust vents with furniture, curtains, or walls.
Use in Enclosed Spaces
Close doors and windows when running the dehumidifier. This prevents humid outdoor air from entering and reduces workload.
Elevate if Needed
In flood-prone areas, place the unit on a small stand or platform to protect it from water damage.
Step 7: Compare Brands and Read Reviews
Not all dehumidifiers are built the same. Research brands known for reliability, customer service, and performance.
Top Brands to Consider
- Frigidaire: Reliable, energy-efficient models with good warranties.
- hOmeLabs: Popular for basements, strong performance, user-friendly.
- GE: Trusted brand with smart features and ENERGY STAR options.
- Eva-Dry: Compact, portable, great for small spaces or RVs.
- AprilAire: Whole-house systems for integrated humidity control.
Read Customer Reviews
Check reviews on Amazon, Home Depot, or Consumer Reports. Look for comments on:
- Noise level
- Ease of use
- Durability
- Customer support
- Energy efficiency in real-world use
Pay attention to recurring issues—like frequent breakdowns or poor drainage—before making a decision.
Step 8: Set a Budget and Shop Smart
Dehumidifiers range from $100 to $600+, depending on size, type, and features. Set a realistic budget based on your needs.
Budget Tips
- Start with essentials: Focus on capacity, efficiency, and core features first.
- Avoid overspending on extras: Fancy apps or Wi-Fi may not be worth the cost.
- Look for sales: Check for discounts during spring and summer (peak humidity season).
- Consider long-term savings: A more efficient model may cost more upfront but save money on electricity.
For most homes, a $200–$350 model with 30–50 pint capacity, ENERGY STAR rating, and auto-humidistat offers the best balance of performance and value.
Troubleshooting Common Issues
Even the best dehumidifiers can have problems. Here’s how to fix common issues.
Unit Isn’t Removing Moisture
- Check the filter—clean or replace if clogged.
- Ensure the room is closed off from outside air.
- Verify the humidity setting isn’t too low.
- Make sure the unit is the right size for the space.
Water Tank Fills Too Fast
- The humidity level may be extremely high—run the unit continuously.
- Use a continuous drain hose to avoid frequent emptying.
- Check for leaks or poor ventilation contributing to moisture.
Unit Freezes Up
- Common in refrigerant models used in cold spaces.
- Switch to a desiccant dehumidifier for temperatures below 60°F.
- Move the unit to a warmer area if possible.
Loud or Unusual Noises
- Check for loose parts or debris in the fan.
- Ensure the unit is level and stable.
- Contact customer support if the compressor is malfunctioning.
Conclusion
Buying an efficient dehumidifier doesn’t have to be overwhelming. By understanding your space, choosing the right size and type, and prioritizing energy efficiency and smart features, you can find a unit that improves your home’s comfort and air quality.
Remember: the most efficient dehumidifier is one that’s properly sized, well-maintained, and used correctly. Take the time to assess your needs, compare models, and read reviews. With the right choice, you’ll enjoy drier air, fewer allergens, and a healthier home—all while saving on energy costs.
Now that you know how to buy an efficient dehumidifier, you’re ready to make a confident, informed decision. Breathe easier and live better with the right dehumidifier for your home.