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 Whole-House Dehumidifiers

Ducted Aprilaire, Santa Fe, and Honeywell picks by pints per day, coverage, and efficiency, plus ducted vs free-standing, 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.

Best Heat Pumps

Trane, Mitsubishi Hyper-Heating, Daikin FIT, and MRCOOL DIY picks, with real SEER2 and HSPF2 numbers, installed costs, cold-climate performance, and which brands last longest.

Quietest Space Heaters

The quietest space heaters are fanless: silent oil-filled radiator and wall-panel picks (De'Longhi, Envi), plus the quietest fan heaters (Vornado, Dreo), how big a room 1500 watts heats, and the safe way to run one.

Best Portable Air Conditioner and Heater Combos

Heat-pump 4-in-1 picks that cool and heat one room: the Midea Duo, De'Longhi Arctic Whisper, Whynter ARC-14SH, and a budget BLACK+DECKER, plus heat pump vs electric heat, sizing by SACC, and whether it beats a mini split.

Best Heat Pump Water Heaters

Rheem ProTerra, A.O. Smith Voltex, a 120V plug-in that skips the panel upgrade, and a Sanden CO2 split for cold garages, with real UEF numbers, installed cost, savings, sizing, and whether one is worth it.