What size dehumidifier do I need?

Match the litre/pint-per-day rating to your space and how damp it is — a small unit can't keep up with a large or very wet basement. A built-in humidistat helps it hold a target level.

Should I run a dehumidifier all the time?

Run it to hold a comfortable humidity via its humidistat, draining to a floor drain or sump for convenience. But also fix the moisture source, or it works harder than it should.

Dehumidifier Guide | theHomework.ca

A dehumidifier pulls excess moisture from the air, which matters in damp basements and humid seasons where high humidity feeds mould, musty smells, and condensation. Choosing the right size and using it well makes the difference.

Size it to the space

Dehumidifiers are rated by how many litres (or pints) of water they remove per day. A small unit can't keep up with a large or very damp basement, so match the capacity to the area and how damp it is. A built-in humidistat lets it cycle to hold a target humidity.

Drain it

Units collect water in a tank you empty, or you can run a hose to a floor drain or sump for continuous operation — far more convenient in a basement. Some models have a built-in pump to push water up to a sink.

Address the source

A dehumidifier manages symptoms, but persistent basement damp usually has a source — poor grading, leaks, or drainage issues. Fixing the water source reduces how hard the dehumidifier has to work, and is the real long-term solution.

Dehumidifier Guide

Size it to the space

Drain it

Address the source

Frequently asked questions