Hello, I'm new to this forum, but from what I've seen so far, there appears to be a lot of good info and smart people on here! That being said, please forgive my HVAC ignorance. I'm definitely in the learning stages!
I'm in the planning/design phase for a house that I'm going to be building later this year or early next year. The house will be in a colder climate with low humidity (Colorado mountains). The house will be stick-built, with special consideration taken to create an air-tight envelope. I have chosen hydronic radiant subfloor heating as the primary heat source. Because the envelope will be air-tight, and my primary heating is radiant, I will be installing an HRV/ERV (with defrost mode) to maintain indoor air quality. Also, per code, I will have exhaust fans in the bathrooms (inline duct fan installed in the attic), and an exhaust hood over the range in the kitchen. At this point, those are all the HVAC related items that I'm fairly certain about.
Now... I'm also considering a smaller, efficient heat-pump unit to provide back-up heating (if something goes wrong with the hydronic), and to provide some cooling in the Summer, if necessary (probably only for a few weeks out of the year).
First of all, does it sound like I'm on the right track with my HVAC decisions? Or am I missing something? Second, if I do have a backup heat-pump unit installed, how does that ducting interact/coincide with the HRV/ERV ducting and/or the bathroom exhaust fan ducting? Do I have separate ducting for the heat-pump, the HRV/ERV, and the bathroom exhaust? Or are some of those combined?
If it helps with the decision, my primary goal for this project is energy efficiency, but at the same time I want to save as much money as possible.
Any help or advice you all might have is greatly appreciated. Thanks!