Options for heating your garage during Oklahoma winters — from space heaters to mini splits.
Why Heat Your Garage?
An unheated garage in Oklahoma can drop below freezing during ice storms, which can freeze pipes running through the space, damage stored paint and chemicals, make your car harder to start, and make the garage unusable as a workshop. Even moderate heating — keeping it above 40°F — prevents most cold-weather problems.
Option 1: Ductless Mini Split
The best permanent solution. A ductless mini split provides both heating and cooling for $2,500-$4,500 installed. It's energy-efficient, quiet, and doesn't require ductwork. You get a comfortable workspace year-round. ARP Heat And Air installs Mitsubishi and other major brands.
Option 2: Electric Space Heater
The cheapest option at $30-$100 for the heater. Good for occasional use but expensive to run continuously — a 1,500-watt heater costs about $0.15/hour in Oklahoma. Not ideal for large garages. Keep away from flammable materials and never leave unattended.
Option 3: Gas Unit Heater
A natural gas or propane unit heater ($500-$1,500 installed) mounts on the wall or ceiling and heats quickly. Good for larger garages and workshops. Requires gas line connection and proper venting. More economical to run than electric for regular use.
Insulation Matters Most
Whatever heating option you choose, insulating your garage makes it 2-3x more effective. Insulate the garage door (kits cost $50-$100), insulate walls if they're unfinished, and seal gaps around the garage door and any windows. An insulated garage with a small heater stays warmer than an uninsulated garage with a large heater.
At ARP Heat And Air, we've been helping Oklahoma homeowners with their HVAC needs since 2011. Our owner Charlie brings 14+ years of hands-on experience and is known for giving honest, practical advice — not trying to upsell you on services you don't need.
If you have questions or need HVAC service in the OKC metro area, give us a call at (405) 413-0583. We offer free estimates, same-day service, and 24/7 emergency response.
Based in Edmond, OK, we serve 19 cities across the Oklahoma City metro area. Oklahoma CIB License #00125054.
Options From Cheapest to Best
1. Weatherstripping and door seal ($30-$100 DIY): Fastest improvement. Garage doors leak massively around edges. A $30 garage door seal kit from a home store cuts 30-50% of air infiltration. Usually makes a detached garage workable in mild weather, insufficient in real cold.
2. Portable kerosene or propane heater ($80-$250): Temporary solution. Moves heat quickly. Drawbacks: fire risk, CO risk if used indoors without ventilation, need to refuel, kerosene smell.
3. Electric baseboard or wall heater ($150-$400 installed): Low upfront cost, high operating cost. Fine for occasional use (weekend garage work), terrible if running 8 hours a day. Electric resistance heat is the most expensive way to heat per BTU.
4. Gas-fired garage heater ($800-$2,500 installed): Serious solution. Dedicated gas line. Venting to outside. Quiet, effective, reasonable operating cost. Best for garages used as workshops.
5. Ductless mini-split ($2,500-$4,500 installed): Best solution if you want both heating AND cooling. Single-zone mini-splits are purpose-built for garage-type applications. Heats down to 20°F+, cools in summer, runs quietly, dehumidifies, minimal structural work (just a line-set penetration). This is what we most often recommend for Oklahoma homeowners using garages as workshops, home gyms, or flex spaces.
Insulation matters more than heat source. An uninsulated garage is a bottomless pit — heat escapes as fast as you add it. R-13 fiberglass batts + a weatherstripped door is the prerequisite for any heating solution actually working.