I don;’t understand my HVAC units at all

I don’t understand my HVAC units at all.

I have three different HVAC units, a window air conditioner , a gas furnace, and a HEPA air filter.

My window air conditioner is just a typica; window air conditioner that you could find at any heating and cooling business, and yet it is so strangely made that I cannot figure it out. When I turn on my window air conditioner it starts blowing warm air, and then cold, and then back to warm, even though I did not change the temperature at all on it. This air conditioner never really worked very well and it often didn’t keep my house as cool as would have liked it to. Next is my gas furnace which works great, but I don’t understand at all how it works. I had an HVAC technician come check out my furnace for a checkup, and I asked him a few different questions about the furnace, and about HVAC units. My last HVAC unit that I don’t quite understand is my HEPA air purifier. Air purifiers in general confuse me, but My UV light HVAC unit does even more. I am kind of an old school type of person, and I don’t see how light can purify air at all, but I trust that the HVAC unit is still working and helping my air to be clean. I love my HVAC units even though I don’t understand them. My window air conditioner is very handy, but it is also very weak. My gas furnace is a little old, but it works great nonetheless. Lastly, my air purifier does help cleanse my air since I saw the air quality shown on my smart thermometer.

 

Air conditioner installation