How to Efficiently Use Air Conditioning for Heating During Winter

As more UK homes and businesses adopt air conditioning systems with heating capabilities, understanding how to use them efficiently during winter is key to maximising comfort, reducing energy bills, and extending system lifespan. 

How Air Conditioning Heats Your Space in Winter

Modern air conditioning systems don’t generate heat in the same way as traditional boilers or electric heaters. Instead, they work as air-to-air heat pumps, extracting heat from the outside air — even in cold temperatures — and transferring it indoors. This process uses significantly less energy than conventional heating methods, making air conditioning one of the most efficient ways to heat a space.

Because heat pump systems are designed to maintain a consistent temperature, they perform best when left running steadily rather than being used intermittently. Understanding this principle is key to using your system efficiently, reducing running costs, and achieving reliable comfort throughout the winter months.

Below are the key points to ensure your system performs at its best throughout the colder months.

Use the Correct Mode

Ensure your system is set to heating mode. Air conditioning works most efficiently when maintaining a steady indoor temperature rather than being constantly switched on and off. If possible, avoid turning the system off overnight in winter, allowing the temperature to drop too low forces the unit to work harder the next day, increasing energy consumption.

Set a Sensible Temperature

For most homes and businesses, a thermostat setting of 19–21°C provides a good balance between comfort and efficiency. Setting the temperature higher than necessary will not heat the room faster but will increase running costs. Air conditioning is designed to deliver consistent warmth rather than bursts of intense heat, so patience and moderation are key.

Make Use of Timers and Scheduling

Take advantage of built-in timers or smart controls to align heating with your daily routine. Scheduling the system to start warming a room or increasing the temperature shortly before it’s occupied avoids unnecessary operation while ensuring comfort when needed. Wi-Fi-enabled systems also allow remote control via smartphone apps, helping prevent wasted energy if plans change and these apps also provide more options around scheduling.

Keep Doors, Windows, and Insulation in Mind

Air conditioning systems perform best in well-sealed, insulated spaces. Keep doors and windows closed while heating to prevent heat loss and consider draught-proofing where possible. Good insulation not only improves comfort but significantly reduces running costs, allowing the system to maintain temperature with less effort.

Maintain Clear Airflow

Ensure indoor and outdoor units are free from obstructions. Blocked airflow makes the system less efficient and can increase wear.

• Keep furniture and other items away from indoor units
• Ensure outdoor units are clear of leaves and other items
• Clean air filters regularly

Clean filters improve airflow, heating performance, and indoor air quality.

Allow for Defrost Cycles

During cold, damp days, outdoor units will enter defrost mode. This is normal and the system maintains efficiency by preventing ice build-up. During defrosting, the system may temporarily reduce heating output. Avoid switching the unit off or changing settings on the controller as this can disrupt the process and reduce overall efficiency.

Pair with Renewable Energy Where Possible

Air conditioning systems used for heating are ideal partners for solar panels or green electricity tariffs. Using renewable energy can further reduce running costs and carbon emissions, aligning with the UK’s net-zero goals.

Schedule Regular Servicing

Regular servicing ensures your system operates safely and efficiently during winter. A professional check can identify issues such as refrigerant levels, airflow problems, or control faults before they affect performance. Well-maintained systems heat more effectively, last longer, and cost less to run.

Getting the Most from Your Air Conditioning This Winter

When used correctly, air conditioning systems in heating mode offer an efficient, low-carbon, and reliable solution for winter heating. By maintaining steady temperatures, using smart controls, keeping airflow clear, and ensuring proper insulation, users can enjoy consistent warmth while keeping energy costs under control.

With rising energy prices and a growing focus on sustainability, efficient winter operation of air conditioning systems is not just smart — it’s future-ready.

Call today to see how A2E Services can help you maximise the benefits of using air conditioning during winter