Garage heater BTU calculator
Estimate garage heating demand from dimensions, insulation and temperature rise.
Energy & HVAC calculators and tools
Estimate garage heating demand, compare generator running and starting watts, and find an HVAC vacuum pump sizing tool.
Choose a tool
Generator wattage calculator
Compare generator output classes against running loads and starting surges.
HVAC vacuum pump sizing
Compare vacuum pump airflow classes using system cooling capacity.
NOAA heat index (°F)
Compute NWS heat-index apparent temperature from air temperature and relative humidity.
NOAA wind chill (°F)
Compute NWS/NOAA wind-chill temperature from air temperature and wind speed for outdoor planning.
Keep power, heat and airflow distinct
Heating demand, electrical output and vacuum-pump airflow use different units. Each tool asks for inputs suited to its own task and provides a preliminary equipment comparison.
- For generators, consider both continuous loads and starting surges.
- For heating, dimensions, insulation and temperature difference all affect the estimate.
- Follow ventilation, electrical and refrigerant-handling requirements in the relevant equipment documentation.