Cold in winter.....hot in summer. That is a conservatory.!! I had one on my
house when I moved in. After two years, realised it was only in use a
limited ammount of time due to extreems of temperature. Have now demolished
it and built a proper extension onto the house, one side proper cavity wall,
with required insulation, other two sides are floor to ceiling glass doors.
Underfloor heating as well, (on a well insulated fllor). the roof is a
proper pitched tiled roof, very well insulated agian, and with 3 velux roof
windows. Now even in winter its warm, with a lovely view out, (also took out
existing lounge wall and made living/lounge area twice as big). In summer
with some vertical blinds to give a fair bit of shade, as well as roof
windows open, allowing heat to escape, the room is fantastic.
Moral is that conservatorys by there nature will be very hard to keep at a