Posted: 03/11/2017 at 19:37
Mine (in Leics) is unheated and double-glazed but I'd say the biggest issue is keeping it cool in summer. I fitted solar powered extraction fans so the stronger the sun, the faster the fans rotate but even with those I need to keep several windows open for most of the year. It can easily hit in excess of 50C in there if the windows are shut which will kill many plants very quickly. I use it to over-winter plants and grow chillies and sweet peppers in the summer. It's also great for those (recently rare) occasions where a very cold snap arrives which threatens seedings in the greenhouse. Because the conservatory is built against the west house wall, it never gets even near freezing point, even in severe weather.