Other than paint there is no viable way to resolve this that I can see. The extractor is above the shower in the 2nd warmest corner. We open the window when showering, leave the fan on for a good period after and keep the door open. The bath is in the cold corner so putting a heater in the cold corner would either require electrics or a bathroom refit. (Can you even put an electric heater above bath taps?!). Wall should have cavity wall insulation.
The only other thing I can think of is trying to add some more/better insulation in the joists above in the roof. But I'm skeptical that would make enough of an improvement in thermal efficiency.
I guess another extractor could be added in the cold corner. Or some kind of super extractor (but the current one is an inline jobbie not a little fan in the window).
There are extractors and extractors. Extraction volume in cubic metres per hour can vary as much as 5x between models. Installing a high end Airflow extractor made a huge difference at our place.
IIRC it's a relatively inexpensive one from Screwfix.
(I know this because I thought it was broken but then my OH discovered I'd turned off the switch in the loft with my arse by accident when climbing the steps)
Cheers.
Other than paint there is no viable way to resolve this that I can see. The extractor is above the shower in the 2nd warmest corner. We open the window when showering, leave the fan on for a good period after and keep the door open. The bath is in the cold corner so putting a heater in the cold corner would either require electrics or a bathroom refit. (Can you even put an electric heater above bath taps?!). Wall should have cavity wall insulation.
The only other thing I can think of is trying to add some more/better insulation in the joists above in the roof. But I'm skeptical that would make enough of an improvement in thermal efficiency.
I guess another extractor could be added in the cold corner. Or some kind of super extractor (but the current one is an inline jobbie not a little fan in the window).
(cold corner = 2 external walls North and West)