Why does a heat pump blow cooler air than a furnace?
A heat pump moves heat rather than creating it, so the air from the vents is warm but usually cooler than furnace air. That is normal. The air should feel noticeably warmer than room temperature, and the house warms over a longer run instead of short hot blasts.
People new to heat pumps often assume something is wrong because the air does not feel hot against the hand. Compare the vent air to the room air. If the difference is clear and the house reaches the thermostat setting, the system is doing its job.
If the air feels cool or the house will not warm up, check the filter and thermostat settings first. A clogged filter cuts airflow and makes everything feel weaker. Beyond that, a technician should look at the system.
What is emergency heat and when should I use it?
Emergency heat is a setting that turns off the heat pump and runs only the backup heat, usually electric strips. Use it only if the heat pump has failed or the outdoor unit is not working, because backup heat is expensive to run and not meant for everyday use.
Many homeowners switch to emergency heat on a cold morning and forget it. Leaving it on can run up the electric bill for no reason. Auxiliary heat that comes on automatically during a big temperature jump is different and is normal.
If your thermostat shows an aux or emergency indicator for long stretches in mild weather, something may be off, such as a failed outdoor unit or a control problem. That is worth a service visit.
Why is my heat pump outdoor unit covered in frost or ice?
A light frost on the outdoor unit can be normal, because the system has a defrost cycle that melts it. Heavy ice that stays, or ice building up all around the coil, points to a problem such as low airflow, a failing defrost control or a refrigerant issue.
During defrost the unit may give off steam and the fan may stop for a short time. That is by design. West Valley winters are mild, so thick ice that does not clear deserves attention rather than patience.
Do not chip at ice with tools, which can puncture the coil. Switch the system off at the thermostat and call a technician if the ice persists. Running a frozen unit can damage the compressor.
How do I prepare a heat pump for the first cold morning?
Switch the thermostat to Heat on a mild day, let it run, and confirm the vents blow warm air. Replace the filter, clear leaves and debris from around the outdoor unit, and listen for odd noises. Fix any trouble before the first cold snap arrives.
In the Valley, a heat pump may sit in cooling mode for most of the year. Switching early finds a bad control board, capacitor or reversing valve problem while you still have mild weather to work with.
Maintenance helps too. A technician can check electrical connections, the refrigerant circuit and the reversing valve that switches between cooling and heating. Vortech handles heat pump repair and AC service across the West Valley.
More questions: Heat Pumps in Arizona: 12 Questions Homeowners Ask