Can You Put Air Conditioning in a Conservatory?
Learn how glazing, roof type, sunlight and insulation affect conservatory heating and cooling.
Yes. A correctly sized fitted split system can cool a conservatory in summer and heat it in winter. Conservatories often need more capacity than ordinary rooms because glazing, roof type, sunlight and insulation change the load. Assess the structure before selecting a package.
A conservatory can become the least usable room in the house.
Direct sunlight heats the glass, floor and furniture. The room can then lose heat quickly after sunset or during winter.
A reversible air-to-air heat pump addresses both problems. It transfers heat outside during cooling and brings heat inside during heating.
Why do conservatories get so hot and cold?
Conservatories have a larger glazed area than most rooms. That changes the cooling and heating load.
Solar gain
Sunlight passes through the glazing and warms internal surfaces.
Roof material
Older glass or polycarbonate roofs may control heat less effectively.
Orientation
South and west-facing rooms can receive stronger afternoon sun.
Insulation
Weak roof, floor or wall insulation increases seasonal temperature changes.
Air leakage
Door, window and roof gaps increase winter heat loss.
Connected rooms
An open connection to the house increases the conditioned area.
A 20m² conservatory can need a different capacity from a 20m² bedroom. Glazing, roof construction and direct sun must be assessed.
What is the best air conditioner for a conservatory?
A fitted inverter split system is normally the strongest long-term option for controlled heating and cooling.
It uses an indoor unit and an outdoor unit connected by refrigerant pipework. The UK Government's Energy Technology List describes reversible air-to-air heat pumps as systems that can provide heating and cooling.
Fitted split system
- Provides controlled heating and cooling.
- Does not need an open window for an exhaust hose.
- Can maintain a selected temperature.
- Uses a permanent indoor and outdoor arrangement.
Portable air conditioner
- Usually provides cooling only.
- Needs a hose through a window or opening.
- Can allow warm outside air back into the room.
- May struggle with high conservatory heat gain.
Read our portable versus fitted air-conditioning comparison before choosing between them.
Can the same system heat the conservatory in winter?
Yes, when it is a reversible heating-and-cooling model. The indoor unit delivers warm air during heating mode.
Winter performance still depends on insulation, air leakage, outdoor temperature and system capacity.
What size air conditioner does a conservatory need?
Do not select a conservatory system from floor area alone.
A suitable assessment should record:
- Room length, width and ceiling height.
- Roof type and insulation.
- Glazing type and total glazed area.
- Direction of the strongest sunlight.
- Blinds, external shading or solar-control glass.
- Whether doors separate the conservatory from the house.
- Normal occupancy and room use.
- Required winter heating performance.
Our air-conditioner sizing guide explains why oversizing and undersizing can both reduce comfort.
| Conservatory feature | Likely effect | Assessment action |
|---|---|---|
| South or west-facing glazing | Higher afternoon solar gain | Record shade and peak-use hours |
| Old polycarbonate roof | Potentially higher summer gain and winter loss | Check roof condition and construction |
| Modern insulated roof | May reduce seasonal load | Confirm insulation and ventilation |
| Open connection to the house | Larger conditioned zone | Measure every connected space |
| Large opening doors | Rapid air exchange when open | Confirm how the room is used |
| External shading | Can reduce direct solar gain | Record when the glazing is shaded |
Where can the indoor and outdoor units go?
Indoor unit position
The indoor unit needs a firm mounting surface, clear airflow and a practical pipe route.
Many conservatories have limited masonry because most surfaces are glazed. A suitable house wall or solid return wall can simplify installation.
- Keep discharge air clear of blinds and tall furniture.
- Avoid directing strong airflow at a fixed seating position.
- Allow service access beneath and around the unit.
- Plan the condensate drain with a continuous fall where possible.
Outdoor unit position
The condenser needs clear airflow, stable support and maintenance access.
It should not sit inside an enclosed conservatory or unventilated box. It must reject heat outdoors during cooling.
The outside position must also meet applicable planning and noise rules. Read our air-conditioning planning-permission guide.
Drainage and electrical supply
Cooling removes moisture from the room air. The indoor unit produces condensate that needs a reliable drain route.
The electrical supply must match the chosen system and installation design. Fixed electrical work must meet applicable requirements.
Does a conservatory's exempt status matter?
Planning Portal states that a conservatory may be exempt from Building Regulations when specific conditions are met.
These conditions include ground-level construction, a floor area below 30m² and separation from the house. It also lists an independent heating system with separate controls.
Adding air conditioning does not prove or remove an exemption by itself. Check the conservatory's construction and planned work with Building Control.
Conservatory heat-load and installation check
This tool identifies factors that can increase capacity or installation complexity. It does not select a final product.
Select the conservatory details, then run the assessment.
This screening tool does not calculate BTU or replace a heat-load assessment. Measurements, photographs and product data are still required.
Should you improve shading or insulation first?
Air conditioning controls room temperature. It does not stop sunlight passing through the glazing.
Reducing solar gain can lower the cooling demand and improve comfort.
Reduce heat entering
- Use effective roof and window shading.
- Review solar-control glazing or suitable film.
- Improve roof and wall insulation where practical.
- Close sun-facing blinds before the room heats up.
Operate the room correctly
- Close windows when outside air is hotter.
- Ventilate when the outside air becomes cooler.
- Keep doors closed while the AC is running.
- Use a sensible set temperature.
Current UKHSA guidance recommends shading sun-facing glazing and opening windows when the air is cooler outside.
Which AC BRUM package could suit a conservatory?
AC BRUM packages start from £1,495 for a suitable standard back-to-back installation.
Conservatory selection cannot use a general room-size chart alone. We confirm capacity after reviewing the structure and heat load.
Send measurements and conservatory photographs
Include the roof, glazing, proposed indoor wall and outside area. We can review the likely package and installation route.
AC BRUM Heating-and-Cooling Packages
Prices cover suitable standard back-to-back installations. Final capacity follows the conservatory assessment.
18,000 BTU heating and cooling for a suitable higher-load application.
View SilverConservatory Air Conditioning Questions
Can air conditioning cool a conservatory?
Yes. A correctly sized split system can remove heat from the room. Solar gain, roof type and glazing must be included in the assessment.
Can the same system heat the conservatory?
Yes, when the product is a reversible air-to-air heat pump designed for heating and cooling.
What size AC does a conservatory need?
There is no safe floor-area answer. Measure the room and assess glazing, roof, sunlight, insulation, occupancy and winter heat loss.
Is 12,000 BTU enough for a conservatory?
It may suit some conservatories. It may be too small for others with the same floor area. The heat load decides.
Is a portable air conditioner suitable?
It can provide temporary cooling. Its exhaust hose and open-window arrangement can reduce performance in a high-gain glazed room.
Where should the indoor unit go?
Use a firm surface with clear airflow, service access and a practical pipe and condensate route. Glazed walls can limit options.
Where does the water from the AC go?
Cooling creates condensate. It normally drains through suitable pipework to an approved outside position or drain route.
Should windows stay open while AC runs?
No. Keep them closed during operation. Ventilate when the system is off and the outside air is cooler.
Does conservatory AC need planning permission?
The outdoor unit must follow the applicable air-source heat-pump planning rules. Property status, system use, unit size, position and noise compliance matter.
Should I improve the roof before fitting AC?
Roof or shading improvements can reduce the load. Compare improvement cost, room use and comfort goals before deciding.
Research Sources
- UK Energy Technology List: split air-to-air heat pumps
- Planning Portal: conservatory Building Regulations
- Planning Portal: domestic air-source heat-pump rules
- UKHSA: keeping homes cool during hot weather
- Daikin UK: air-to-air heat pumps for hot and cold rooms
The topic reflects recurring homeowner search questions. Technical and regulatory claims use official or manufacturer guidance checked in August 2026.
Make the Conservatory Usable All Year
Send room measurements and photographs of the roof, glazing, indoor wall and outside area.