Ventilation - Air-conditioning

airconcond

For 29 years we used thermostatically controlled storage heaters and since our bungalow is airtight and very well insulated, the running costs of storage heating was reasonable.

However, in 2018, we removed all the storage heaters and had a 7.5kW air-sourced heat pump fiited driving two cassettes and a wall unit. 

We used this system for the 2018-19 winter with two cassettes in the main hall, but they were not quite sufficient to heat our bungalow.

So, in 2019, we had an additional 5kW air-sourced hear pump fitted to heat and cool the lounge and provide additional heating to the bedroom area.

We had tried a stand-alone portable air-conditioner but it was incredibly noisy and needed a huge snakey hose.

 

5kW Heat Pump

By having two air-sourced heat pumps, we have redundancy and back-up should one of the units fail. 

It is also unlikely that both heat pumps will need to run concurrently since sufficient heating or cooling should be available from a single unit unless the weather is exceptionally hot or cold.

It is worth noting that a 7.5kW unit uses a maximum of 2.5kW because of the 3:1 efficiency ratio.

Although we remain on an Economy 7 tariff, our electricity consumption and charges have been considerably reduced by switching from the storage heaters.

 

 

Ventilation and air-con controllerIn the photo on the left, the black left display controls the forced ventilation and heat recovery system; this ensures that the bungalow has sufficient air changes per hour.

The white unit on the left is an airconditioner controller.  It is worth noting that airconditioning does not replace air, the ceiling units either heat or cool the existing air.

The white controller can use four programmes for each day of the week.

 

 

Ceing air conditioning cassetteThis is a typical ceiling air conditioning cassette.  Air is sucked in through the centre where it is then heated in winter or cooled in summer and then blown out through the four vents on the edges.

This is a 2.5kW unit, but, because of the 3:1 efficiency ratio, it uses a maximum of 800W of energy.  With the exception of the lounge and main bedroom, no rooms have individual heaters.

The ventilation system brings fresh air into the bungalow and also provides air movement and so avoids the use of individual room heaters.