How Heat Pumps HandleFreezing Nights

Las Vegas is famous for intense summer heat that lasts for months, keeping your cooling equipment running constantly. However, our winter weather requires genuine heating power. According to the National Weather Service, Las Vegas experiences about 10 nights a year that fall to freezing. Gas furnaces and heat pumps both do real work here. A heat pump heats without burning fuel.

The Science of Moving Heat

To understand how a heat pump works in freezing weather, you must first understand how it cools your home in the summer. An air conditioner uses electricity and refrigerant to absorb heat from inside your house and release it outside. A heat pump contains a reversing valve that flips this process. During the winter, the system absorbs heat from the outdoor air and moves it inside to warm your rooms.

It might seem impossible to extract heat from freezing air, but thermal energy exists in the air until the temperature reaches absolute zero. Even at 32°F, the outdoor air contains enough heat for the refrigerant to absorb. Starting in 2025, new residential heat pumps are manufactured for lower-impact refrigerants, such as R-454B and R-32, which efficiently transfer this thermal energy.

Managing Freezing Conditions

When the outdoor temperature drops to freezing, condensation on your outdoor unit can turn into ice. This is a normal part of the heating process. To manage this, heat pumps feature a built-in defrost cycle. When the system detects ice buildup on the outdoor coil, it temporarily reverses its operation back to cooling mode. This sends hot refrigerant outside to melt the ice. During this brief defrost cycle, the indoor fan may stop or blow slightly cooler air until the ice melts and normal heating resumes.

Since January 1, 2023, new heat pumps nationwide must meet at least 14.3 SEER2 and 7.5 HSPF2. You might also qualify for local incentives if you upgrade. The NV Energy PowerShift program offers discounts on qualifying heat pumps, applied through approved contractors.

Maintenance for Winter Performance

Because your heat pump works year-round to cool and heat your home, regular maintenance is vital. ENERGY STAR recommends checking your cooling equipment in the spring and your heating equipment in the fall. During a fall tune-up, our technicians perform several tasks:

• Check the blower and filter
• Test the thermostat’s heating cycle
• Perform the heating-mode and defrost checks
• Provide a written report of anything worth watching

Your ductwork and filter also play a role in winter performance. According to ENERGY STAR, a typical house loses about 20 to 30 percent of the air moving through the ducts to leaks, holes, and poorly connected joints. A clean filter keeps air moving through the system. ENERGY STAR advises checking your filter every month and changing it at least every three months.

Planning for Replacement

A heat pump runs in summer and in winter. Your outdoor unit sits in direct sun and monsoon dust for months before switching to heating duty. According to Carrier and ENERGY STAR, heat pumps commonly last 10 to 15 years, while gas furnaces commonly last 15 to 20 years. ENERGY STAR suggests considering replacement of a heat pump older than 10 years, though we never recommend replacement on age alone.

If your current system struggles on freezing nights, have it checked. The technician shows what failed and gives repair and replacement options when both are reasonable. When you call Kestrel Heating & Air for a free, in-home replacement estimate, we evaluate your whole home. We look at your rooms, insulation, windows, sun exposure, and existing ductwork before recommending a size. We provide a written price and present two or three equipment options when multiple systems fit your needs. Our owner, Elena Navarro, reviews every replacement estimate.