Why Colorado Garages Get So Cold

Most garages in the Denver metro aren't connected to your home's HVAC system. They have no insulation in the door, thin walls, and a concrete floor that absorbs cold. When it's 10°F outside, your garage might be 15-20°F — cold enough to freeze anything stored there and make working impossible.

Budget Fixes (Under $200)

Insulate the Garage Door

The garage door is the biggest source of heat loss. DIY insulation kits cost $50-100 and can raise garage temperatures by 10-15°F on their own. Foam board or reflective barrier kits are the most common options. They install in about 2 hours with no special tools.

Seal Gaps and Cracks

Check the weatherstripping along the bottom and sides of the garage door. Replace any that's cracked or compressed. Seal gaps around the service door (the regular door from the house to the garage), windows, and where the walls meet the floor. Every gap lets cold air pour in.

Portable Space Heater

Electric space heaters can warm a small area for short periods. They're cheap ($30-80) but cost a lot to run and only heat the area right around them. Good for occasional use but not a permanent solution. Never leave one running unattended, and keep it away from anything flammable.

Mid-Range Solutions ($200-$1,500)

Insulate Walls and Ceiling

If your garage has exposed studs, adding batt insulation and drywall makes a huge difference. This is a weekend DIY project that typically costs $500-1,000 in materials. Insulated walls combined with an insulated garage door can keep the garage 25-30°F warmer than outside.

Garage-Rated Infrared Heater

Ceiling-mounted infrared heaters heat objects and people directly rather than heating the air. They work well in garages because they're effective even in drafty spaces. Cost is $150-400 for the unit plus installation.

Permanent Solutions ($1,500+)

Ductless Mini Split

A ductless mini split is the gold standard for garage heating and cooling. It provides both heat in winter and AC in summer, runs efficiently, and is quieter than most space heaters. A single-zone mini split for a 2-car garage typically costs $3,000-5,000 installed. This is a permanent upgrade that adds real value to your home.

Gas Garage Heater

Natural gas unit heaters mount to the ceiling and provide powerful, efficient heat. They cost $500-1,500 for the unit plus $500-1,000 for installation (gas line and venting). They're popular in Colorado because natural gas is cheap here and they heat quickly.

Safety warning: Never use a propane heater, charcoal grill, or gas stove to heat a garage. These produce carbon monoxide, which is deadly in enclosed spaces. Always use heaters rated for indoor/garage use.

Which Option Is Right for You?

If you use your garage occasionally, insulation plus a portable heater is fine. If you work in your garage regularly or use it as a gym/workshop, a ductless mini split or gas heater is worth the investment. Either way, start with insulation — it makes every heating option work better.