Utility rebates for heat pumps are becoming the money homeowners actually see at the end of an install. ACHR News coverage of utility rebate operations reports that heat pump incentives are shifting from federal tax credits to utility programs, and that "contractors are increasingly responsible for getting customers, and themselves, through the rebate process." That shift moves a lot of paperwork into the install. It does not move the equipment's real behavior into any file. A rebate record captures a model number, a date, and a contractor. It does not show how the system draws current on a hot afternoon in your house.
You can close that gap with a clamp meter, a thermostat runtime log, and a few minutes on a day with steady weather. The goal is a baseline you can repeat, not a laboratory result.
What to have in hand
Bring a clamp meter that reads AC amps and AC volts, rated for the work you plan to do. Take a photo of the outdoor unit nameplate, which lists the rated load amps and the minimum circuit ampacity. Pull your thermostat's runtime history, or keep a notebook for start and stop times if your thermostat does not keep one. Gather the last two utility bills with their billing dates.
Take the baseline
Shut off the outdoor disconnect only if you are comfortable doing so, and never open anything past the cover plate. Let the outdoor unit run for at least fifteen minutes before the first reading, because startup current and early pressures do not represent steady operation. Clamp one conductor at a time on the compressor leg. Record the amps, the line voltage at the disconnect, the outdoor temperature, and your indoor setpoint. Repeat the reading for the air handler blower if your meter can reach it.
Compare the compressor reading to the rated load amps on the nameplate. A reading that runs well above that number is a question for a licensed technician, not a number to explain away with a guess about the weather.
Turn amps into energy
For single-phase residential equipment, power is roughly volts times amps times power factor. Most clamp meters do not report power factor, so state the value you assume and use the same value for every reading. Divide the result by one thousand to get kilowatts, then multiply by the hours the compressor ran during the period, taken from your thermostat log. The total is an estimate of energy use for that window. It works well for comparing two runs taken under similar outdoor conditions, and it is weak as an absolute claim. Three-phase equipment needs a different formula, so leave that calculation to the person who services it.
Why the bill is a poor witness on its own
A monthly bill mixes the compressor, the blower, the water heater, the refrigerator, and anything else plugged in. The billing period also spans weather you did not control. A rebate program may pay out on the install date, while your utility bill arrives every month, so the two timelines rarely line up. Use the bill to check the direction of change over several months, then use your meter to check the equipment itself.
When the two disagree, look for the variable that changed before blaming the unit. Check the filter, the supply registers, the thermostat schedule, and any second appliance you forgot about. Airflow problems often show up as higher amps and longer run times, so a restricted return can make a healthy compressor look guilty.
Keep the record with the rebate file
Put your readings, dates, outdoor temperatures, and the nameplate photo in the same folder as the rebate paperwork. If a utility program asks for documentation later, or if the system starts losing capacity, you have a dated trail that began before any argument did. Write filter change dates and setpoint changes beside each reading. A log with gaps is still more useful than no log at all.
Measure only what you are equipped to measure. Live voltage at a disconnect is not a casual task, and a meter with the wrong safety category is a hazard, not a tool. When the readings point toward a refrigerant, airflow, or electrical fault, bring the log to a licensed technician and let them make the repair call.