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Heating, Cooling & Insulation

Garage heaters, insulation, air conditioning, ventilation fans and dehumidifiers, sized from your own garage instead of rules of thumb.

A comfortable garage gets used all year. These guides explain insulation and air sealing, garage heaters, air conditioners and mini splits, dehumidifiers and ventilation fans, and size equipment from your own garage rather than rules of thumb.

How to use this topic

  1. Seal air leaks and insulate the door, walls and ceiling before sizing any equipment.
  2. Size heating with the Garage Heater Size Calculator and ventilation with the Garage Ventilation Calculator.
  3. Keep humidity below 60 percent, ideally 30 to 50 percent, as EPA suggests for mold control.
  4. Follow the safety rules: keep anything that can burn 3 feet from heaters and never idle a car in the garage.

Start here: Heating, Cooling and Insulation hub · Garage Heater Size Calculator · Garage insulation guide · Garage dehumidifiers

Building wall wrapped in insulation boards behind scaffolding Heating, Cooling & Insulation

Garage Insulation: Walls, Ceiling, Door, Costs and R-Values

How to insulate a garage: what to insulate first, batt, blown-in, rigid foam, spray foam and radiant barrier compared, R-values by climate, costs by garage size, air sealing and moisture.

Updated · 9 min read

Red garage door panels in close-up Heating, Cooling & Insulation

How to Insulate a Garage Door: Kits, Steps and Costs

How to insulate a garage door yourself: foam panel, fiberglass batt and reflective foil kits compared, step-by-step installation, sealing gaps, spring balance and when a new insulated door makes more sense.

Updated · 10 min read

Exhaust fans mounted high on the wall of a building Heating, Cooling & Insulation

Garage Ventilation Fan: Types, Sizing and Placement Guide

How to ventilate a garage: exhaust fans, intake vents, window and attic fans compared, how to size airflow, where to place fans, which controls help and why a fan never makes running engines indoors safe.

Updated · 10 min read

Red cast iron radiator against a red wall Heating, Cooling & Insulation

Garage Heater Guide: Electric, Gas, Infrared and Sizing

How to choose a garage heater: electric, infrared, propane, natural gas and portable heaters compared, with sizing, installation costs, carbon monoxide and fire safety, and insulation tips.

Updated · 10 min read

Close-up of a dehumidifier control panel with a digital display Heating, Cooling & Insulation

Garage Dehumidifier: Sizing, Drainage and Moisture Control

How to choose a garage dehumidifier: how to tell if your garage is too damp, ENERGY STAR sizing by dampness, drainage options, cold-weather performance and the moisture sources to fix first.

Updated · 10 min read

Living room with a wall-mounted mini split unit near the ceiling Heating, Cooling & Insulation

Garage Air Conditioner: Mini Split, Window or Portable?

How to cool a garage: window, portable, through-the-wall and ductless mini split air conditioners compared, with sizing, insulation, costs, electrical and condensate tips.

Updated · 10 min read

Wall-mounted heating panel beside a light switch on a gray wall Heating, Cooling & Insulation

Electric Garage Heater: Sizing, Wiring, Costs and Safety

How to choose an electric garage heater: fan-forced, infrared and portable units compared, watts, amps and 240-volt circuits explained, installation and running costs, thermostats and fire safety.

Updated · 10 min read