The people I was with and I don’t exactly entertain out of neighborhood guests all the time. Yet, I am also very glad to offer an Heating, Ventilation, and A/C comfortable room to family and friends. I was sort of raised this way. My folks were constantly having people stay the night if they were passing through. It made growing up in that new home a lot of fun because there were a lot of interesting people coming through. I lucked out because our wifey was raised in the same fashion. But, it makes it strenuous to offer a guest room that is colder than the rest of the new home by at least 10 or 15 degrees. Guests prefer that room in the summer. The Winter is quite another story altogether. I searched and searched for the source of that cold. It wasn’t the window and I could not locate a draft no matter how strenuous I searched. It ended up being a guest who showed myself and others the solution. He suggested I install a room to room ventilation system. It’s basically a little fan put inside an adjoining wall. The fan then pulls warmer air into the chilly room. I took him up on the suggestion while he was there. He was much more of a handy man than I was. And, I easily didn’t want to have to spend money someone to do something that appeared to be so straight forward. The people I was with and I were able to start after lunch, finish a few hours later and were in time for glad hour. I could not guess the difference it made. Not only was the chilly guest room now the same temperature, it felt care about the Heating, Ventilation, and A/C temp was more balanced in that entire section of our home.