Long, dark evenings and damp, frosty mornings are a real test for any heating system, so it’s no surprise people ask whether a heat pump can cope. The short answer is yes. A well designed air source heat pump keeps working below freezing, defrosts itself when ice builds up and runs best on steady, gentle settings rather than short bursts. If you’re in Paisley or elsewhere in Renfrewshire and thinking about one, our heat pumps page explains what we install.
How a heat pump gets heat from cold air
An air source heat pump takes heat from the outside air using a refrigerant, which can absorb heat even when the air feels cold. A compressor raises the temperature of that heat, and it’s passed into your radiators or underfloor heating and your hot water cylinder.
Because it’s moving heat rather than burning fuel, a heat pump can deliver more heat than the electricity it uses. It works harder and less efficiently as the outside temperature drops, but it doesn’t stop working on a cold day.
What to expect in cold, damp weather
Defrost cycles
In cold, damp conditions, frost can form on the outdoor unit. The heat pump runs a short defrost cycle to clear it. You may see steam rising from the unit or notice the heating pause for a few minutes. That’s normal.
Longer running times
A heat pump runs for longer than a boiler at lower water temperatures. The radiators feel warm rather than hot, but the house stays at a steady temperature. That’s how it’s designed to work.
The importance of good design
How well a heat pump copes in winter depends a lot on how it’s designed and installed. The unit needs to be sized properly for the home’s heat loss, and the radiators need to be big enough to heat the rooms at lower temperatures. Getting this right at the start matters more than anything else.
Getting the best from a heat pump this winter
- Leave it to run steadily. Avoid turning it off and on or making big changes to the thermostat.
- Keep the outdoor unit clear. Make sure leaves, snow and garden furniture aren’t blocking airflow around it.
- Don’t close lots of radiator valves. Heat pumps work best when water can flow through most of the system.
- Check the hot water settings. Your installer can advise on the right schedule for your cylinder.
- Have it serviced. A regular service keeps it running efficiently.
Heat pumps in Renfrewshire homes
Renfrewshire’s mild but damp winters suit heat pumps well, but the type of home makes a difference. A newer, well insulated house in Erskine or Renfrew is usually more straightforward than an older sandstone property, which may need insulation improvements or larger radiators first. A proper survey shows what your home needs. If a heat pump isn’t the right fit yet, a modern gas boiler may still be the better option for now.
Frequently asked questions
Do heat pumps work below freezing?
Yes. Air source heat pumps keep working at temperatures well below freezing, as the refrigerant can still absorb heat from cold air. They become less efficient as the temperature drops, so a properly sized system is important to keep your home warm through the coldest spells.
Why is my heat pump steaming?
It’s usually a defrost cycle. In cold, damp weather, frost builds up on the outdoor unit, and the heat pump briefly reverses to melt it. The warm unit meets cold air and produces steam. It’s normal and usually lasts only a few minutes.
Should I turn my heat pump down at night?
Usually only slightly, if at all. Heat pumps work best running steadily, and a big drop overnight means working hard to recover in the morning. Many people keep a steady temperature or a small night-time setback. Your installer can advise on the best settings for your system.
Will I need new radiators for a heat pump?
Sometimes. Heat pumps run at lower water temperatures, so some rooms may need larger radiators to stay warm. A heat loss survey works out what each room needs. Many existing radiators can stay, but it depends on the size of the room and the radiator.
Thinking about a heat pump?
If you’d like to find out whether a heat pump would suit your home, give us a call on 07715 980674 or drop us a message and we’ll talk you through the options.