Installing Wall-Mounted Air Conditioning for a Large Room in Andover

We’re looking to install a wall-mounted air conditioning system for a large, single-storey room at the back of our detached house in Andover. The room is about 12 x 4m, south-facing, with 6 skylights, 5 wide bi-folding doors, and 2 large windows. It’s not a conservatory—it has solid walls and a roof—but the extensive glass makes it too hot in summer and too cold in winter. We have underfloor heating, but it’s expensive and doesn’t help in the summer. There’s space for an outdoor unit on the ground, and we believe the property has sufficient power. We need supply and fit services.

Choosing the Right Air Conditioning System

Installing air conditioning in a room with extensive glazing, such as your south-facing space in Andover, requires careful consideration of its size and thermal dynamics. The room’s 12 x 4m dimensions, combined with the skylights, bi-folding doors, and large windows, make it highly prone to heat gain in summer and significant heat loss in winter. A wall-mounted split air conditioning system is an excellent choice, providing both efficient cooling and supplemental heating through inverter technology.

The unit’s cooling capacity needs to match the room’s requirements, accounting for its size, glazing, and solar exposure. For a room of this size, a 7kW (or higher) unit would likely be appropriate. Modern AC systems with advanced sensors and zoning options can efficiently manage temperature while minimising energy consumption.

Installation Considerations

For your room’s layout, a wall-mounted unit should be installed on an internal wall, ideally positioned to optimise airflow across the entire space. The outdoor condenser unit can be placed on the ground on the available side of the house, ensuring good ventilation and accessibility for maintenance. Connecting the two units requires a clear path for refrigerant piping and electrical wiring.

Given the room’s glazing and orientation, selecting a unit with advanced energy-saving modes and dehumidification features is advisable. Brands like Daikin, Mitsubishi Electric, and LG offer reliable systems that combine sleek designs with high performance. Many models also integrate smart controls, allowing you to manage settings remotely via smartphone apps.

Year-Round Comfort and Efficiency

A modern AC unit with a heat pump function provides efficient cooling in summer and supplemental heating in winter. This can reduce reliance on costly underfloor heating, lowering your overall energy bills. Look for systems with high Seasonal Energy Efficiency Ratio (SEER) and Coefficient of Performance (COP) ratings to maximise energy savings.

Additionally, installing thermal blinds or reflective window films on skylights and glass doors can help mitigate heat gain in summer and retain warmth in winter, further enhancing the AC system’s efficiency.

Cost, Timeline, and Preparation

The cost of supply and installation for a high-capacity, wall-mounted AC system typically ranges from £2,500 to £4,500, depending on the brand and features. Air conditioning installation in Andover is generally completed within 1–2 days, with minimal disruption to your daily routine. To prepare, ensure the intended installation areas are clear of obstacles, and check that your property’s electrical system can handle the additional load.

For more information on choosing the right air conditioning system, visit our guide to AC installation. If you’re considering other energy-efficient upgrades, our tips on sustainable home improvements might also be helpful.