A blue glass conservatory roof – expensive whilst only offering a small increase in thermal insulation
‘solar’ glass as it can also be called is the most expensive option on the market which also does not include replacing the whole roof. Whilst this is a definately better option than standard glazing or polycarbonate, it does still suffer from the same problems associated with a glass roof.
The thermal improvements are slim. Recent articels and studies along with many customer report that the small difference is not worth the hefty price.
Insulation therefore is the only way to get a conservatory that you can use all year round.