Calculators
Free, no-signup calculators that put real numbers behind HVAC decisions, for contractors sizing an opportunity and homeowners weighing a repair.
What these calculators do
Every calculator on this page runs in the browser with no account and no signup. Contractors enter their own numbers, callbacks, ticket averages, agreement counts, and get back a dollar figure they can check against their books. Homeowners enter a system age, a region, or a cooling bill and get back a range that frames what a qualified diagnostic would confirm.
The numbers are grounded in published field data: DOE fault-prevalence research, ACCA callback cost figures ($650 service / $850 install), and Southface Energy Institute capacity findings. They are estimates, not diagnoses. A measured diagnostic from a contractor using HVAC Vitals™ replaces the estimate with a scored, documented reading.
For a deeper ROI model, see the full Callback Calculator and ROI Calculator. For the evidence behind the numbers, see Cut Callbacks and the downloadable sample reports at Sample Reports.
For homeowners
-
Repair or Replace? Second Opinion Checker
Answer five questions about your system's age, its symptoms, and the diagnosis you were given. The checker weighs repair against replacement and points you toward a measured diagnostic before you spend on either.
-
Summer Cooling Cost Forecaster
Pick your region and see a projected seasonal cooling bill based on national and regional forecasts. A tune-up before peak season can narrow the gap between projected and actual.
-
Skipped Maintenance Cost Estimator
Enter your cooling bill and see how much you may be losing to skipped maintenance. The range is grounded in published efficiency-loss research, and a measured diagnostic confirms the real number.
-
Capacity You Are Paying For
Enter your system's tonnage. The calculator shows a delivered-capacity range based on field observation, so you can see the gap between what you paid for and what your system is actually delivering.
-
System Health Self-Check
Five questions about your system's age, maintenance, and performance. Returns a Lower, Moderate, or Higher likelihood-of-issues band. This is a self-check estimate, not an HVAC Vitals™ score.
For HVAC professionals
-
Callback Cost Calculator
Enter your monthly callbacks and cost per callback. The calculator returns your monthly and annual callback drag, the number a service manager needs before building a reduction plan.
-
Callback Reduction ROI
Enter your jobs per month and your current callback rate against a target. The calculator estimates the savings from closing the gap, anchored on DOE and Southface fewer-callbacks findings.
-
Maintenance Revenue at Risk
Enter your active maintenance agreements and renewal rate. The calculator sizes your annual churn and the recoverable revenue from improving retention by even a few points.
-
Revenue Per Ticket Uplift
Enter your average ticket, monthly visits, and a target uplift percentage. The calculator projects the added monthly and annual revenue, grounded in DOE and Southface field findings on documented diagnostics.
-
Customer Savings Proof Generator
Enter rated and measured efficiency plus the customer's cooling cost. The generator produces a potential-savings figure to present during the call, framed as an upper bound if performance is fully restored.
-
Service Area Opportunity Sizer
Enter the number of systems in your service area. The sizer multiplies by the DOE fault-prevalence range to estimate how many carry a diagnosable, billable fault, with an optional gross-dollar ceiling.
When an estimate is not enough
These calculators give you a starting number. A measured diagnostic gives you the real one. An HVAC Vitals™ report scores the system against live conditions, documents every finding, and replaces the range with a grade the homeowner can keep.