As the outside temperature drops, the heating demand of your property will increase. This means a heat pump will need to work harder to keep a property at the desired temperature. Inevitably, the running cost of a heat pump will increase, similar to a boiler. Every property we MCS has been designed to sub-zero running conditions. We ensure that all our systems will still perform in cold conditions, with a slight buffer to allow for those all time record cold days – or when someone sneakily changes your thermostat 2°C higher.