Thanks Alex, yes the extractor fan could be connected to the light circuit with a delayed switch-off. From personal experience, I grew to quickly despise this set up (in my own home), having the fan come on every time I switched on the light, whether it was to clean my teeth or shower, so I am conscious of pushing that annoyance on to someone else. However, this is still an option as performance is the priority, but well being and ease of living is also important.

This is a new build, so I’m working through the implications of each option…climate zone 2. Haven’t talked about heating yet, but yes that is also an option, however again, given that this will be a rental and expenses will tight (we know this for a fact), I doubt if the tenants would use it because of the (perceived) cost. Although this could be managed or at least address with tenant training.

Good idea Alex around estimating the heat loss, thanks. The annoyance of the fan was the noise, it was old and loud (and rubbish) and the unnecessary use of it when I only required a light, I would often use the hallway light for the bathroom, so I didn’t have to turn it on. The new fan we have (with our renovated bathroom) is far superior on every level. This is the reality of any new fan we would consider as well.

Thanks Fred, I will investigate that option further!