No, I don’t think I can blame the MS for this one. I think it’s the house. Although not an “old” house - built about 1990 - they were starter homes on a shared ownership scheme, so they didn’t bother with double-glazing, to try to keep the prices down.
I wish I’d had the option to pay a bit extra and have the double-glazing, as I’m sure it makes all the difference - the temperature doesn’t keep going up-and-down like a yo-yo, depending what it’s doing outside.
Also the house is draughty - particularly the front door. It has gaps all round you can see daylight through, and when the wind’s round that side of the house, it comes through those, and through the letterbox too. A draught can make it feel constantly chilly, even if a glance at the thermometer shows the temperature’s not really very low. I grew up in a double-glazed house, so I find it quite shocking that new builds in the 90s didn’t have it as standard. These days, with so much more emphasis on energy-saving and the environment, I bet it’s not OK to build houses without double-glazing, any more than it would be to build them without wall or loft insulation.