Never in a million years will I forget this creepy sales call that I had to go out on all by myself back when I was working for an Heating, Ventilation and A/C contractor here in town. I was stressed to go to this lake house on the outskirts of city to try and sell a modern heating method to this guy who lived in a really old house. Well, when I arrived I thought the place was abandoned! The yard was full of trash and the place looked like an old dump. But I was supposed to sell this guy a gas furnace, and so I went up on the porch and knocked on the door. This creepy dude came to the door and invited myself and others in. The whole place was creepy and it looked like a horror film set! Nevertheless, I decided to set up my presentation on all of the gas heating systems and gas heating systems that the people I was with and I had available at the Heating, Ventilation and A/C dealer. As I started talking about oil gas furnaces, gas gas furnaces, heating pumps, and ductless mini-split systems, I kept hearing this weird scratching sound coming from the walls, then finally I asked him what that sound was and he said that it was Mabel. I asked who Mabel was, assuming it was his pet or something. And then he said something that made the hair lay up on the back of my neck! He said that Mabel was the lady who lived inside the walls! I packed up my heating method presentation as fast as I could and I got the heck out of there. I don’t care if this guy was going to buy more than two oil gas heating systems from me, and no commission on any gas furnace or oil furnace was worth sticking around there with this creepy guy and Mabel. 
The different types of thermostats