Oh! I watched your tiny home tour a while ago! Yes, I can see why your definition of a well sealed home is likely a lot different than what would be considered

Oh! I watched your tiny home tour a while ago! Yes, I can see why your definition of a well sealed home is likely a lot different than what would be considered "well-sealed" for a typical new home, as well as why concerns about oxygen and CO2 are a factor. I mentioned that HRV's are essentially standard where I live, which is in Canada, so I think our largest concern here has to do with condensation which can quickly become an issue in any non-drafty indoor space in our extremely cold winters. If the HRV is not set high enough in the winter, ice will build up on the inside of our windows and then melt into the wall structure, causing potential issues.