A dressing room is a small room with a short occupancy and little solar gain unless it has a big window. If the door to the bedroom stays open, the bedroom unit may already be doing the work. If the door stays shut, the dressing room needs its own indoor unit or it will not be cooled. Keep the capacity small so it does not short-cycle, keep the throw off the spot where you stand to dress, and leave wardrobe doors able to open without hitting the fascia. The install is F-gas work. In England, the outdoor unit follows the Planning Portal.
A borrowed room with the door shut
Dressing rooms are often internal, borrowed from the bedroom. With the door open, one bedroom indoor unit can temper both, as long as the throw is not blocked by the door leaf. With the door shut, the bedroom unit stops at the door. Clothes and a person changing do not justify a large kW. A small capacity after a survey is the usual machine. If you dress with the door shut, the dressing room needs its own unit, or the bedroom unit will not reach it. If the door stays open, the bedroom unit may be enough. Say which you do.
Often the small end of a domestic range, after a survey. These rooms are easy to oversize, and an oversized unit short-cycles. Keep kW small after a survey.
Wardrobes, a pump and one outdoor unit for two rooms
Wardrobes cover the solid wall the bracket wanted. What remains may be a pier beside the door, which puts the unit in a corner and dumps a draught on your head. A short run of clear wall above the door line, throwing along the room, is better if the structure allows it. Leave wardrobe doors clear of the unit. Do not aim the jet at the mirror where you stand.
Condensate in an internal room usually needs a pump to a proper drain. Say there is no outside wall in the room if that is true, so the pipe route is priced.
A dressing room plus a bedroom is a common multi-split pair: one outdoor unit, two small indoors. That is one planning object rather than two. On a house that is not detached, a second outdoor unit can fall outside permitted development. Read the Planning Portal summary before you add a condenser just for the wardrobe. F-gas certification applies to the circuit.
Recirculated air is not a drying cupboard
Windowless rooms still need their ventilation as designed. A split recirculates. It is not an extract fan. Do not tape any required vent to make a tiny room feel colder. Energy Saving Trust's air-to-air description matters if you also want a little heat so the room is usable in January. Heat is still room air, not a drying cupboard for wet clothes. A split is not a tumble dryer and it is not ventilation.
Frequently asked questions
Does a dressing room need its own air conditioner?
If you dress with the door shut, yes, or the bedroom unit will not reach it. If the door stays open, the bedroom unit may be enough. Say which you do.
What size is sensible?
Often the small end of a domestic range, after a survey. These rooms are easy to oversize, and an oversized unit short-cycles.
Can I dry laundry in there with the heating mode?
A split heats and recirculates. It is not a tumble dryer and it is not ventilation. Keep the room's own ventilation, and do not block it.
What if the dressing room has no outside wall?
Say so. Condensate in an internal room usually needs a pump to a proper drain, and the pipe route has to be priced. The outdoor unit in England still follows the Planning Portal.
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How this guide was prepared
This guide was written by the Local AC Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.