I've just had a new house built in Atlantic Canada. It's not performing as well as I had hoped it would - I'm getting condensation on my windows and door handles and my power bill is higher than I expected.

I know I rushed things a bit with the build, and we were on a tight budget, but I (naively?) thought that following the building code would get me a "good" house.

I've done a little research and found that I have a very generic, builder basic level, air exchanger - a FanTech Flex100. Their own documentation even only lists the efficiency as "moderate". My initial reaction to this discovery is that air exchanger efficiency is critical - it's literally bringing in colder air than it really needs to - and I should look into upgrading as soon as I can afford it.

Does this make sense, or are there other factors I should consider first.

(I know there's lots of detail missing - I didn't want to put in too much effort for a question in what appears to be a dead community. Happy to elaborate as much as needed.)