Things to know
Controls
Most systems are operated by a wall-mounted remote control which sets the temperature, controls a timer and sets the fan speed.
Auto mode
This is a feature that automatically switches the unit between heating and cooling in order to maintain a pre-set temperature.
Air speeds
At least three air speeds are available on most models. You need a high speed for fast warm-up from cold, and lower speeds as the temperature controller starts to operate. Low fan speed means fewer draughts, less energy consumption and a quieter operation.
Fan-only mode
Lets you circulate the air on a hot day without the added expense of cooling.
Louvers
Most models have louvers that automatically adjust to direct the air flow for optimum heating or cooling. On some, the fins can oscillate to distribute the air evenly over the room.
De-icing
In very cold climates the outside unit can build up ice on the evaporator, which effectively stops the unit from functioning. A de-icing feature prevents this.
Outside units
Look for an unobtrusive place on a north, west, or east wall, not too close to the neighbors, and somewhere where air can circulate freely around the unit. If you live in a coastal area, make sure you get a corrosion-resistant exterior unit. Avoid south facing walls - heat pumps work better with a little sun.
Timer
A heat pump can be expensive if you run it all the time over winter. To allow you to avoid this, most have a timer, either 12-hour or 24-hour. A real-time 24-hour clock is best, as it lets you program the appliance for optimum night-and-day operation without having to re-set it every day.
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Noice
The fan in the inside unit of a heat pump should produce little more than a low hum in low-speed mode, but the compressor plus fan of the outside unit can be quite noisy. Take care to site the unit where it will not disturb you (or the neighbors!)
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Filters
Various levels of filtration are available, and some filters are specially treated so they deodorize and "purify" the air. Filters don't last forever and should be replaced according to the manufacturers' recommendations. They need regular cleaning, but it's easy enough to do.
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Heat output
For most split systems, heat outputs might range from around 2.5kW - enough for a bedroom - to about 8kW, which should easily heat most open plan lounge/dining areas. Comfortably heating an average UK home generally requires a unit in the living area and another in the bedroom area. Ducted systems can range up to around 15kW
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