One thing I have l gained in the last year about central heating and a/cs is to never crank them at their top capacity! Not that anyone would want to do that, but when your central heating and a/c breaks down, a lot of people try to turn the thermostat to the max to see what it would do.
This could really end up killing your central heat and a/c equipment and make it burn out. I l gained this when I ended up doing exactly that the last time our heating and a/c had an issue. When the certified heat and a/c specialist from the local heating and a/c supplier came to look at the broken down Heating and A/C system unit, they said that I needed a whole up-to-date heat and a/c system. They then asked myself and others if I cranked the thermostat all the way down or up, and when I told them I did, they said that had I not done that, he would have been able to repair our central heating and a/c unit. As at first, all it happened to be was a blown out fuse. Now, because I cranked the thermostat all the way down, it blew out the entire motor of the central heating and a/c and the circuits, then so now it is dead. The only solution is a brand up-to-date heating and cooling unit. So I l gained our lesson and l gained it hard. Never crank the thermostat of the central heating and cooling system unit!