Use rated input carefully
Capacity is not electrical demand. Use documented kW or an appropriate efficiency relationship for the exact operating mode and equipment combination.
SYSTEM + RATE + RUNTIME
How much will this HVAC system cost to run?
Model an explicit period with your electricity rate and a visible load assumption—without pretending one month predicts a year.
READ THE RESULT
Three inputs control the estimate.
Keep equipment performance, household operation and utility pricing separate so a sales estimate can be reproduced.
Model runtime as a scenario
Weather, thermostat settings, sizing, ducts and building load change runtime. Compare low, expected and high hours instead of treating one month as annual truth.
Use an all-in rate
Divide the bill total by kWh for a household indicator, then test tariff changes separately. EIA averages are benchmarks, not an address-specific utility offer.
BOUNDARY
This is energy math, not a savings guarantee.
It does not model demand charges, fuel switching, backup heat, maintenance or future rate changes unless you enter them as separate scenarios.