Heat Recovery Ventilation

Heat recovery ventilation is an energy efficient way of providing fresh air and getting rid of stale air to homes and offices. It is becoming more and more important as fuel prices rise and buildings become more and more air tight.

Why do I need it ?

Traditionally when an air conditioning system was installed, you had what we all know as the air conditioning unit in the room. This is the box on the wall or the thing in the ceiling that blows hot or cold air.

In addition to this you had a fan that sucked the stale air out and another fan that blew fresh air in.

Now think about this scenario a little deeper. In fact what you are doing in summer is this:

Imagine it is 30°C outside and you want your room at 21°C. You switch on the air conditioning and set the thermostat at 21°C. So far so good..... Only there is a problem. Your extract fan is sucking this 21°C room air out. It has cost you money that 21°C air, surely you want to keep it!

........and to make matters worse, your fresh air supply fan is bringing in more 30°C air for your air conditioning to cool down again....increasing your energy usage and fuel bills.

In winter things get worse.

Now imagine it is 0°C outside and you want to heat the room to 21°C. All that money you are spending heating up your room is being sucked out and replaced by fresh air at 0° C!!!!! Not good.

What's the solution?

Heat Recovery Ventilation, that's the solution.

Heat Recovery Diagram

Your 21°C air is now being extracted, and as it passes through the heat exchanger approximately 80% of the heat is recovered and stored in the recouperator.

At the same time this is happening the 0°C air from outside passes through the heat recovery coil. Here it picks up the stored heat and brings you fresh air that has been warmed up by the air you are extracting.

Where would I use one of these?

Anywhere you have an extract fan you are wasting energy. You are paying money to heat up or cool down a room then throwing it away.


Call us now on 01942 386166

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