Measure the area you want to dehumidify (room size and ceiling height)
Check the moisture problem type (musty odor, condensation on windows, damp basement, crawl space)
Match capacity to the space using pint capacity or “liters per day” for your humidity level
Consider the humidity target and current indoor relative humidity (%RH)
Choose the right operating mode (continuous drainage for basements; bucket for smaller spaces)
Prefer an automatic humidistat with adjustable setpoints
Select the appropriate fan speed range (fixed vs variable) for your comfort needs
Ensure it can handle the temperatures you’ll run it at (especially basements/cold rooms)
Look for an Energy Star or similar energy-efficiency rating
Check coverage claims vs real-world conditions (use manufacturer specs and your climate)
Decide on drainage method (built-in hose port for continuous drain vs removable tank)
Verify the tank capacity if using a bucket (how often you’re willing to empty it)
Confirm the unit’s noise level (especially for bedrooms or offices)
Choose features that matter to you (auto-restart, defrost, child lock, washable filter, washable intake)
Check for air filter quality and ease of cleaning
Consider portability needs (casters, handles, weight, and dimensions)
Verify hose length and drain height compatibility if using continuous drainage
Ensure the unit fits your space with clearance for airflow and maintenance
Review warranty length and service availability
Compare airflow (CFM) and dehumidification performance at relevant humidity levels
If multiple rooms are involved, consider ducting/whole-home options or multiple units
For severe moisture sources (leaks, flooding, ongoing water intrusion), address the source before relying on a dehumidifier