Air to Air Heat Pumps FAQs

Q. What are Air Source Heat Pumps (ASHP)?

Air Source Heat Pumps (ASHP) are renewable heating systems which extract heat energy from the air surrounding a building and then releasing this energy in to a house. There are two different types, Air to Air, which works like an air conditioning unit and Air to Water, which uses the heat energy to heat water in a boiler for a more traditional wet heating system.

Q. What is the difference between Air to Air and Air to Water Heat Pumps

Air to Air Heat Pumps use heat energy from the surrounding air to heat building in the same way as an air conditioning unit and are only recommended for small buildings. They blow hot air around ducts and out of vents in to specific rooms.

Air to Water Heat Pumps use heat energy from the surrounding air to heat water in a more traditional water boiler for general hot water use and heating purposes. The hot water is pumped in to radiators much the same as a traditional wet heating systems.

Q. What are Exhaust Air Heat Pumps?

Exhaust Air Heat Pumps are designed for small dwellings and extract air via ductwork connected to the warm areas of the building such as bathrooms, kitchens and utility rooms and distribute the warm air to the cooler areas of the building.

Q. What are the advantages of Air Source Heat Pumps?

There are several advantages to Air Source Heat Pumps, these include; reducing your household/buildings heating energy requirement by up to 50%, they are very quiet, earn you points on the Code for Sustainable buildings and are able to output 4 times more heat per unit of electricity used than other conventional heating systems.
An air to air heat pump can provide both heating and cooling, and some models have air purification technology which is beneficial to allergy sufferers.

The heat pump comprises of an outdoor and indoor unit which converts heat energy in the air into heat in the home. The outdoor unit extracts the energy in the air outside the property. This heat is absorbed by refrigerant solution within the unit, turned into hot air by the indoor unit and distributed within the property. Heat Recovery Ventilation (MVHR, HRV) works by recovering heat from extract air that would normally be expelled to the atmosphere and transferring this heat to fresh air being drawn into the property via a heat exchanger, which the system then distributes throughout.

The system brings ducting to each habitable room and each wet room within the property. Each wet room is fitted with an extract valve, and each habitable room with a supply. The system continually extracts from the wet rooms, boosting if necessary, removing the pollutant air quickly and effectively at its source. This air then passes up through the system of ducting and travels through a heat exchanger where its heat passes to the fresh filtered air which is being brought into the property at the same time.

The pollutant extract air leaving the property never comes into direct contact with the fresh air being brought in. In an air-to-air heat exchanger, the incoming and outgoing airflows are separated by a solid barrier. Providing that there is a difference in temperature between the two airflows, heat from the warmer airflow will be transferred through the barrier to the cooler airflow. The heat from the warm, pollutant air leaving the building is transferred to the cool, fresh, filtered air entering the building. Heat Recovery Systems are extremely efficient; they are capable of recovering upwards of 90% of the heat from the outgoing air.

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