Heating and Cooling — FAQ
What size heater do I need for a 2-car garage?
A 2-car garage (400-600 sq ft) requires 7,500-10,000W of heating power. Undersized units will run constantly without reaching target temperatures. Always calculate based on your specific ceiling height and insulation levels.
Can I install a hardwired heater myself?
Only if you're licensed for 240V electrical work. Improper installation risks fire or electrocution. Most hardwired units require a dedicated circuit installed by a professional electrician—budget $200-$500 for installation.
Are infrared heaters better for garages?
Yes for drafty spaces. Infrared heats objects directly (like your body and tools) rather than the air, making it 20-30% more efficient in unsealed garages. However, it provides less ambient warmth for whole-space heating.
How much does it cost to run a 7,500W heater?
At $0.15/kWh, a 7,500W heater costs $1.13 per hour to run. Actual costs drop 30-50% with thermostat cycling. ECO modes can reduce this further by detecting idle periods and lowering output automatically.
Do garage heaters need GFCI protection?
Yes—especially in damp environments. GFCI outlets prevent electrocution by cutting power during electrical faults. Hardwired units should connect to GFCI-protected circuits as per NEC code requirements since 2020.
Can I leave a garage heater running overnight?
Only if it has automatic shutoff features and is certified for unattended use. UL-listed units with overheat protection are generally safe, but never leave portable heaters running when you're not present in the garage.
