FAQs – Mechanicool

Frequently asked questions

Here we answer the questions that we get asked most often about air conditioning.
Can air conditioners be used to heat your home?

Yes! Although most people think of air conditioners for cooling their homes in the summer months, they can also be used for heating in the winter. Whilst conventional air conditioners might only produce cool air, modern air conditioning units increasingly produce warm and cool air. Modern units heat your room by reverse cycle, meaning that during colder months when used in heating mode, they bring in heat from the outside and transfer it inside to warm your rooms.

Heating your home is one of the biggest uses of household energy, typically accounting for over 60% of your energy consumption. Whilst boilers and radiators powered by oil or gas have always been a popular choice, people are now seeking more modern heating solutions such as heat pumps or air conditioners to heat their homes. Air conditioners are very efficient for heating homes during the colder winter months, producing about five times more heat than boilers for each kilowatt of electricity used.

While boilers and radiators powered by fossil fuel are still the primary means of heating across Europe, the technology behind central heating is not deemed to be the most energy efficient way to heat your home. Combined with increasing fuel costs, this is one of the main reasons people are looking for other ways to heat their homes in colder months.


Although most people consider air conditioners for cooling their homes in the summer, they are actually also a great heating solution for your home. Air conditioners are extremely energy efficient, producing approximately 5kW of heat for each kW of electrical energy used, compared to under 1kW of heat per kW of energy from a boiler. This shows that over long term use, an air conditioner is more cost effective.


In addition to being more cost effective, air conditioners will also help to reduce household carbon emissions which is why governments across Europe are now advocating the move away from fossil fuel based heating systems.

Air conditioning systems are rated on their cooling output. A 2kW air conditioning system produces 2.7kW of heating output from the same unit. When compared to a 2kW electric heater, that’s 30% more heat output.
Air conditioners work by transferring heat from one area to another. When they are in cooling mode, the air conditioner transfers heat from the inside of your home to the outside. In heating mode, the air conditioner transfers the heat from the outside of your home to the inside.

Yes when compared to central heating systems powered by fossil fuels. Air conditioners (also known as air-to-air heat pumps) take heat energy from the outside air and bring it into your home to warm the air inside. The heat is taken from ambient air rather than being generated by burning fuel and this use of renewable energy is what reduces the running costs and makes air conditioners a much more sustainable heating solution for your home.


While there are other sustainable solutions for heating your home when it comes to replacing your heating system, an efficient heat pump is often the best option if you are planning renovation work and is usually the preferred choice for new build homes.

Once per year is recommended, but if your equipment is making more noise than usual or not heating or cooling as much usual, that can be a sign that you need more immediate attention. We offer regular servicing and maintenance visits to help ensure that your equipment continues to perform as its best.

If you are looking for ways to reduce your energy costs and be more sustainable in your energy consumption, but don’t want to overhaul your entire heating system, you could consider adding air conditioners to the one or two rooms where you spend the most time. Even that could provide a significant cost saving. You could continue to use your central heating system for hot water, and use radiators to heat only the rooms where you spend less time. That way you still have radiators as back up option in the rooms you use infrequently, and you get the benefits of heating your home in a more energy and cost efficient way in the main living areas of your home.

 

Using air conditioners to replace radiators in the rooms that you use most can still bring a number of benefits:

 

  • It is much cheaper than replacing your entire heating system – the installation work required to replace an entire heating system is much greater than the work required to install a single split for a single room, or a multi split for multiple rooms.

  • It improves energy efficiency – utilising your air conditioner to heat the areas of your home that you use the most will cost less than using your boiler to generate the same amount of heat. Central heating is more expensive to run, particularly with rising fuel prices, so using an air conditioner alongside radiators in your home will help balance out the costs.

  • It offers year-round climate control – by replacing radiators with air conditioners, you have an efficient and economical heating system for the winter, and you will also have the option to use your air conditioner for cooling during those hotter summer months.

    If you want to try air conditioning in a single room before making a decision to invest for other rooms, you can choose to install a single air conditioning unit in one room. However, if you think there is a strong possibility of you switching all areas of your home to air conditioning in the future, you may wish to consider a multi-split system. Whilst this will require more work to install, it gives you the flexibility to connect up to five indoor units. This would be more cost-effective in the long run if you choose to make a switch from radiators to air conditioners throughout your home.

Some people feel more confident having a member of our team cleaning their unit on their behalf, but you don’t need a professional to clean your unit or perform the regular checks we have suggested. The task just needs to be approached with care. Carrying out regular checks yourself is beneficial as it will help you to understand what normal functioning feels like and you will be better able to detect when things go wrong.


With some issues though, a specialist skillset is required to remedy a problem and prevent further damage. For example, if you notice a leak, it could be time to call in a professional for a repair. Leaks can indicate there are blockages in the pumps or tubes, or signal other kinds of damage.


If you notice the refrigerant levels are low, there’s a good chance of a leak somewhere in the unit. If your unit is working properly, you should never need to add more refrigerants. So, if you notice lower levels than usual, a professional should be called.

Yes, we do recommend that you get your unit serviced by one of our experts. We would generally advice that this is done every year. Spring is usually the best time for a service, so that any issues can be fixed before the hot summer months.
During a service our engineers would usually clean your unit, replace your air filters, inspect the pumps and thermostat, and conduct a thorough inspection of the whole unit for damage or issues which need to be addressed. Having a regular service will give you peace of mind that your equipment is in good working order.

Following these maintenance tips will help to ensure that your air conditioner stays running in optimum condition for as long as possible. If you do need any help with your cleaning or maintenance, or you suspect your unit is faulty, call in one of our experts. They will be able to help fix any issues before a bigger problem can arise.