Air Conditioner Size CalculatorFind the right size air conditioner for a room. Room Area (sq ft) Sun ExposureShaded roomNormal exposureVery sunny room Kitchen?Not […]Attic Insulation CalculatorEstimate how many bags of blown insulation an attic needs. Attic Area (sq ft) Target R-ValueR-30R-38 (most climates)R-49 (cold climates)R-60 […]BTU CalculatorEstimate the heating or cooling BTUs needed for a room. Room Area (sq ft) Ceiling Height (ft) Climate / InsulationMild […]Duct Size CalculatorSize rectangular or round ducts for HVAC airflow. Airflow Required (CFM) Max Air Velocity600 FPM (bedroom/quiet)900 FPM (living areas)1200 FPM […]Energy Savings CalculatorCalculate annual energy savings from an efficiency upgrade. Old Device Wattage (W) New Device Wattage (W) Daily Use (hours) Electricity […]Heat Loss CalculatorEstimate heat loss through a building element. Surface Area (sq ft) R-Value of Assembly Temperature Difference (degrees F) CalculateReset HEAT […]Mini Split Sizing CalculatorFind the right size mini-split for a room or area. Area to Condition (sq ft) Ceiling Height (ft) Climate ZoneMild […]Room Heater Size CalculatorFind the right wattage space heater for a room. Room Area (sq ft) Insulation QualityWell insulated (8 W/sq ft)Average (10 […]Thermostat Savings CalculatorSee how much you save by adjusting thermostat settings. Setback Amount (degrees F) Hours per Day Energy Rate ($/therm) Heating/Cooling […]Ventilation CalculatorFind the required CFM for bathroom, kitchen, or whole-house ventilation. Room Area (sq ft) Ceiling Height (ft) Air Changes per […]Whole House Fan CalculatorSize a whole-house fan for your home. Home Square Footage (sq ft) Ceiling Height (ft) Air Changes per Hour CalculateReset […]