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.
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.