How do I know what size unit my house needs? March 11, 2021 19:50 Updated To choose the right unit for you house, you can refer to this link which explains in details on to size the unit. Related articles Up to what temperature can my Heat pump operate? Do I need to do anything for my warranty to be valid? Does my system come with everything needed to connect power to my outdoor unit? I want to order a Multi-Zone unit, but I can't find the combination I need on your website? The line sets that came with my Multi-Zone system have a different size connector than what's on my outdoor unit, how can I connect them? Comments 0 comments Please sign in to leave a comment.