SIPs Does the Heavy Lifting
Every Green Rooms build uses Structural Insulated Panels in the walls, floor and roof. SIPs delivers U-values comparable to modern housing — meaning your garden room retains heat efficiently in winter and stays cool in summer without constant energy input.
The result: most garden room users find they need very little heating or cooling for moderate temperatures. A well-insulated SIPs room is typically comfortable from around 5°C to 25°C outdoor temperature with no active climate control.
Your Climate Control Options
None
Budget optionSIPs insulation alone keeps the room comfortable across most of the year. Many customers bring their own plug-in heater for winter — perfectly adequate for occasional use.
No extra cost
Smart Heater Panel
Most popular for hobby roomsThermostat-controlled electric panel heater, fitted and wired as part of the build. Efficient, quiet, and programmable — the right choice for regular use without daily all-year demand.
+£330
2.5kW Air Conditioning
Best for offices up to ~25m²Split-system AC unit that heats in winter and cools in summer — one unit, one dedicated circuit. Ideal for a daily garden office where year-round comfort is essential.
+£1,860
5kW Air Conditioning
Best for larger rooms or heavy useHigher-output split-system for bigger rooms or spaces with high thermal demand — gyms, golf simulators, or large open-plan rooms used intensively.
+£2,740
What Most Customers Choose
For a garden office used daily year-round: the 2.5kW AC unit (+£1,860) is the best value. It heats in winter, cools in summer, and installs cleanly as part of the build on its own dedicated circuit.
For a hobby room or occasional use: the Smart Heater Panel (+£330) is usually enough. The SIPs insulation heats the room quickly and holds the temperature well — and you can always add AC later.
Talk Through Your Climate Control Options
We'll recommend the right heating and cooling solution for your usage pattern during the free site visit — there's rarely a one-size-fits-all answer.
Book a Free Site Visit