I am in upstate NY. 1st winter with my system. Installer out of business because of fire. Have another dealer coming next week to familiarize himself with my installation for any future warranty/service work needed. Thought I would ask you folks what to expect. I have 2 waterfurnace envision units on a closed horizontal loop. Currently, considering wind chill, it is about 5 degrees outside. Both units are running at stage 1. They run for about 30minutes, and shut off for 7-10minutes. keeping the temp at 71 degrees. I assume that since they are staying in stage 1, things are doing fine. Given the outside temp, is it " normal "for them to run nonstop for 1/2 hr. Thanks for your help. RS