Reviews & buyer's guides

Best Portable Air Conditioners

Picks by category plus what actually matters when buying.

Best Mini Split Air Conditioners

DIY, value, and premium picks, plus how to size one.

Best Casement Window Air Conditioners

Vertical and slider window picks, plus the no-install portable alternative and how to measure your window.

Best Dehumidifiers

Picks by room size and pint capacity, from a bedroom to a big basement.

Best Smart Thermostats

Nest, ecobee, Amazon, and Honeywell picks, and the C-wire question.

Best Air Purifiers

True-HEPA picks ranked by room size and CADR.

Best Window Air Conditioners

Double-hung window unit picks by noise, efficiency, and value.

Best Whole-House Humidifiers

Furnace-mounted bypass and fan-powered picks, with sizing and install.

Best Smart Air Conditioners

WiFi window, portable, and large-room picks with app, schedule, and voice control, plus the cheapest way to make an AC you already own smart.

Best Humidifiers

Room and warm-mist picks chosen first for how easy they are to keep clean, plus how often to clean one and cool vs warm mist.

Best HVAC UV Lights

Coil-sterilizing UV-C picks (Honeywell, OdorStop, Fresh-Aire, RGF), what a UV air filter actually does, what it costs, and whether it is worth it.