Calculators

Calculate the Energy Efficiency Ratio (EER) of an air conditioner or cooling system using cooling capacity and electrical power input. EER equals cooling output in BTU per hour divided by power input in watts.

Calculate the coefficient of performance (COP) for an HVAC system using heating or cooling output and electrical power input. COP is the ratio of useful thermal output to electrical energy consumed.

Estimate HVAC system efficiency using cooling output, electrical power use, seasonal runtime, climate factor, and system age. This calculator approximates effective seasonal efficiency as adjusted BTU output per watt-hour consumed.

Estimate annual energy cost savings from upgrading or optimizing an HVAC system based on conditioned area, current annual HVAC energy cost, system efficiency improvement, climate impact, and annual operating hours.

Estimate HVAC energy consumption and operating cost based on system size, runtime, efficiency, electricity rate, and seasonal demand.

Estimate the electricity cost to run an HVAC system based on unit power draw, daily runtime, number of days used, local electricity rate, and system efficiency factor.

Estimate monthly HVAC operating cost based on system size, runtime, electricity rate, system efficiency, and climate demand.

Estimate annual cooling cost savings when upgrading from an existing air conditioner to a higher-SEER system based on capacity, runtime, electricity rate, and system efficiency.

Estimate an air conditioner’s SEER rating from cooling output and electricity use, and compare annual operating cost based on local usage and electricity price.

Estimate annual cooling energy cost and yearly savings when upgrading to a higher SEER2-rated air conditioner or heat pump. SEER2 is the seasonal energy efficiency ratio under updated testing standards; higher values generally mean lower electricity use for the same cooling output.

Estimate the recommended bathroom exhaust fan capacity in CFM based on room dimensions, ceiling height, and how many times per hour you want the air exchanged.

Estimate the recommended kitchen range hood airflow in CFM based on cooktop width, cooking surface type, cooking intensity, hood mounting style, and duct length.

Estimate the recommended range hood airflow in CFM based on cooktop width, stove type, cooking style, and duct run length. This calculator provides a practical sizing estimate for residential kitchen ventilation.

Estimate the recommended whole house fan airflow in CFM based on home floor area, ceiling height, desired air changes per hour, and a climate/ventilation factor.

Estimate the recommended attic fan airflow in CFM based on attic floor area, attic height, roof pitch, climate heat load, and sun exposure. This calculator uses a baseline air-exchange approach with adjustment factors for attic conditions.

Estimate the airflow in CFM required for a supply or return register based on room size, ceiling height, ventilation quality, and room usage. This helps size a register for general residential airflow planning.

Calculate air changes per hour (ACH) using room dimensions and airflow. ACH estimates how many times the total air volume in a room is replaced each hour.

Estimate the required fresh air ventilation rate in CFM based on floor area, ceiling height, target air changes per hour, number of occupants, and activity level.

Estimate the airflow a fan should provide in cubic feet per minute (CFM) based on room size, ceiling height, desired air changes per hour, and ventilation efficiency.

Estimate the required exhaust fan airflow in CFM based on room dimensions, desired air changes per hour, and ventilation effectiveness.

Estimate the total installed cost for duct wrap insulation based on duct surface area, wrap thickness, insulation material, job complexity, and labor rate. Surface area should reflect the total exterior square footage of ductwork to be wrapped.

Estimate the recommended rectangular HVAC trunk duct size based on total airflow, target friction rate, duct aspect ratio, and design velocity. This calculator helps size a main supply trunk by calculating the required duct cross-sectional area and resulting equivalent trunk width for a chosen height-to-width ratio.

Estimate recommended round branch duct diameter based on required airflow, target friction rate, effective duct length, and fitting losses using a simplified residential HVAC sizing approach.

Estimate the maximum equivalent duct length allowed for a ventilation run based on fan rated maximum equivalent length, duct diameter, number of elbows, and wall cap type. The result reflects a common equivalent-length approach where fittings and smaller duct sizes reduce the straight duct length available.

Calculate the true length of a duct offset using rise, run, number of elbows, and fitting angle multiplier. Useful for estimating material length needed for an offset section in HVAC ductwork.

Estimate airflow in cubic feet per minute (CFM) for a room using room size, ceiling height, target air changes per hour, and a system factor for typical ventilation or HVAC applications.

Estimate required HVAC airflow in CFM based on room size, ceiling height, desired air changes per hour, and a system/load factor.

Estimate airflow in cubic feet per minute based on room size, ceiling height, air changes per hour, and system efficiency. Useful for HVAC ventilation planning and sizing airflow requirements for residential or light commercial spaces.

Calculate the recommended airflow in CFM for a room based on room dimensions, ceiling height, and desired air changes per hour.

Calculate required airflow in CFM based on floor area, ceiling height, desired air changes per hour, occupancy load, and ventilation intensity factor.