Tools & calculators
HVAC and water heater calculators
Compare energy costs, explore airflow and get reference estimates for moisture control and hot-water demand.
Use your own figures. These tools explain a calculation; they do not diagnose a problem, select equipment or quote a project.
Energy costs
SEER cooling-cost calculator
Compare two cooling efficiency ratings using the same system capacity, cooling hours and electricity price.
AFUE furnace savings calculator
Estimate how a different furnace efficiency rating changes fuel cost when heating demand and fuel price stay the same.
Heat pump vs. furnace running-cost calculator
Compare the energy cost of delivering one million Btu of heat with a heat pump and a gas furnace.
Air and moisture
Moisture-range illustration
Explore how area and a broad dampness description change a legacy reference range. This is an illustration, not equipment sizing. Start with the moisture source.
Room ventilation airflow calculator
Calculate airflow from room volume and a target number of air changes per hour.
Before you choose equipment
Keep the calculation’s assumptions with the result. A lower modeled running cost does not include purchase price, installation or maintenance. Sizing estimates need a site-specific assessment.
Other tools
Find the relevant service or prepare questions for an assessment.
Explore the Load & Savings EstimatorUse the symptom checkerPlan your projectBefore you decide
What your results mean
Which tool fits the decision I am trying to make?
Use SEER or AFUE for a limited efficiency comparison, heat-pump running cost for entered operating conditions, water demand for simultaneous fixtures, ventilation for room-volume arithmetic and the project planner for discussion notes. A symptom checker routes concerns; none establishes a diagnosis or final equipment selection.
Your next step
Ask about your HVAC or hot water
Enter your first name, last name, email and phone. We’ll follow up to confirm your property address, service needs and availability.
