What to record during the first week with a new heat pump

Your first week with a new heat pump comes down to one deadline and one habit. The deadline: DCSEU asks for rebate paperwork within 30 days of installation. The habit: a short log of room comfort, outdoor temperature and when backup heat runs. At Perennial DC Heat Pumps we install ducted systems across Washington, DC; this is an organizational checklist for your first week, not a diagnosis of any system.

Where did the paperwork go?

Put the handover records in one folder: indoor and outdoor model and serial numbers, the AHRI certificate for the matched pair, the refrigerant type and charge, startup readings, the DOB mechanical permit, the paid itemized invoice and the manuals. Those same documents make up most of a DCSEU application, so gathering them now covers both.

Our rebate guide lists what DCSEU asks for, including the distributor invoice and, for a gas conversion, proof the fuel system was removed. The quote checklist shows which records should have been agreed before work started. If anything is missing, ask for it this week, while the 30-day window is still open.

One room feels off: what should you write down?

Write down the room, time, outdoor temperature and thermostat setting whenever something feels wrong. “Back bedroom, 7 a.m., 28°F outside, set to 68°F, reads 64°F” is something we can work with; “upstairs feels cold” isn’t.

Heat pump air often feels cooler at the register than furnace air did, and the system runs longer, steadier cycles. That alone isn’t a fault. Differences between rooms usually come down to distribution, and our rowhouse guide and ductwork page explain why top floors behave differently. If you change registers, schedules or fan settings, change one at a time, a day apart, so you can tell what each did.

What do “aux” and “emergency heat” mean on the thermostat?

Most heat pump thermostats show four states worth knowing: heat, cool, auxiliary heat and emergency heat. Auxiliary means backup is helping the heat pump; emergency means backup alone, with the compressor off. Emergency heat is for a failed outdoor unit, not a cold morning, because resistance heat delivers one kWh of heat for each kWh it uses.

Our thermostat guide separates your settings from installer configuration such as lockout temperatures. The defrost and auxiliary guide explains why the display may show auxiliary heat briefly during defrost on damp days near freezing. Leave the installer menus alone; note what you see and ask us.

Frost, ice or water where it shouldn’t be?

Note it from a safe distance. Don’t open electrical panels, remove covers, chip ice off the coil or reach near the fan. A photo from normal standing height of frost, ice or pooled water is enough. A hazardous condition goes to your equipment’s service provider or emergency services; we don’t offer repair dispatch.

For humidity, a basic hygrometer in the problem room gives readings our humidity guide can help you read. Water near the indoor unit points to the condensate drain, trap or float switch described on the air-handler page, and should be reported promptly.

Turning your notes into good questions

Make the log into specific questions. When does auxiliary heat come on, and at what outdoor temperature? Which room lags, by how many degrees, at what time? Where exactly is the water? Specific patterns let us compare what you see with the startup records and configured settings.

Hold off on energy conclusions. Our running-cost guide shows that each 100 kWh adds about $15.40 in OPC calculator components before riders and taxes, but a fair comparison needs a whole season of bills. If a replacement is likely down the road, keep the log with your equipment records and request an estimate when the time comes.

A short log beats a long one. Five or six accurate entries across different weather, each with room, time, outdoor temperature and mode, usually tell us more than a daily diary of guesses.