If you’ve ever stepped into your conservatory on a hot July afternoon and felt like you’ve walked into a greenhouse, you’re not alone. One of the most common calls we get is from homeowners asking whether conservatory air con installation is really the only way to make the space usable in summer. The honest answer is that there are a few things you can try first, but some options work better than others.
In this guide, I’ll talk you through the practical steps you can take. We’ll start with simple, low-cost fixes and work up to longer-term solutions, including air conditioning. The aim is to help you make the space comfortable, not just bearable.
Why Conservatories Overheat in Summer
Conservatories are brilliant for light. That’s also their downfall.
You’ve got large areas of glass on the walls and the roof, often south or west facing. Sunlight comes in, heats the floor tiles, the furniture, even the brickwork. That heat then gets trapped. It’s the same principle as a greenhouse.
Many older conservatories were built with minimal ventilation and little thought for shading. I still see plenty around Bromley and Bexley with fixed windows and no roof vents at all. Once the temperature climbs past 25 degrees outside, inside it can easily hit the mid 30s by mid-afternoon.
And if you’re working from home in there or using it as a playroom, that’s not just uncomfortable. It’s exhausting.
Simple Ways to Reduce Heat Build-Up
Open Windows and Create Cross Ventilation
It sounds obvious, but it helps. If you can open windows on opposite sides of the room or open the conservatory doors into the garden and a window into the main house, you create airflow.
Roof vents are even better. Hot air rises, so giving it somewhere to escape makes a noticeable difference.
Use External Shading
Anything that stops the sun hitting the glass in the first place will reduce heat gain. External blinds, awnings or even temporary shade sails work better than internal blinds because they block the heat before it passes through the glazing.
A few customers in Peckham have fitted retractable awnings over south-facing conservatories and said it took the edge off straight away on bright afternoons.
Close Internal Doors
If the conservatory is overheating, keep the internal doors to the main house closed during the hottest part of the day. Otherwise the heat drifts into your kitchen or lounge and makes the whole ground floor uncomfortable.
Switch Off Heat Sources
It’s surprising how much difference small things make. Turning off underfloor heating in spring before that first warm spell and not running appliances in there during the day can help. If you’ve got electric underfloor heating installed, make sure the thermostat isn’t still on a winter schedule.
Long-Term Solutions: Blinds, Films and Ventilation
Solar Control Window Film
Window films are applied directly to the glass and reflect a portion of the sun’s heat. They’re fairly unobtrusive and don’t change the look of the conservatory too much.
They can reduce glare and bring temperatures down a few degrees but they won’t turn a baking hot room into a cool retreat on their own.
Thermal or Reflective Blinds
Good quality conservatory blinds, especially those with reflective backing, are more effective than standard fabric ones. Roof blinds in particular make a difference because that’s where most of the heat comes through.
The downside is that when they’re closed, you lose some of the light you built the conservatory for in the first place.
Improved Roof Systems
Some homeowners opt to replace polycarbonate roofs with tiled or solid insulated systems. This can make a big difference to temperature control, both summer and winter.
It’s a bigger project though, and not every property suits it. If you use the space all year round as a dining room or office, it can be worth considering.
Why Air Conditioning Is the Most Effective Option
After trying the steps above, many people reach a point where they say, “We just want it comfortable, whatever the weather.” That’s where air conditioning comes in.
A properly sized air conditioning unit will actively remove heat from the room, not just move air around. On a 30 degree day, you can set the room to 21 or 22 degrees and it will stay there.
Modern systems are quiet and efficient. They also provide heating in winter, which is useful if your conservatory struggles to stay warm. I’ve installed plenty in Bromley, Bexley and Peckham where the conservatory becomes the most used room in the house once temperature is no longer an issue.
Choosing the Right System for Your Conservatory
Not all air conditioning units are equal, and conservatories need careful sizing.
Because of the amount of glass, heat load calculations are critical. Oversize the unit and it will cycle on and off inefficiently. Undersize it and it will struggle on hot days.
Wall-mounted split systems are the most common choice. They’re neat, effective and relatively straightforward to install. In some layouts, especially where wall space is limited by glazing, we might look at floor-mounted units instead.
If you’re into home automation, it’s also worth thinking about how the system integrates with your controls. Many modern units can link into wider smart home systems, allowing you to adjust temperatures from your phone or set schedules around when the sun hits the room.
The key advice I give customers is this. Treat the conservatory like an extension, not an afterthought. If you want to use it every day, it needs proper climate control.
Creating a Comfortable Year-Round Space
Keeping a conservatory cool in summer starts with simple steps like ventilation and shading. For some homes, that’s enough to make the space manageable.
But if your conservatory regularly becomes too hot to sit in, even with blinds closed, air conditioning is by far the most reliable solution. It gives you control. Not just in July, but all year round.
If you’d like practical advice tailored to your property, you can book a consultation today. The team at Henri-Taylor can help you weigh up your options and find a solution that genuinely works for the way you use your home.