I totally agree that if you want to grow the best unfortunately in an indoor grow, you will need high level equipment, in order to do it all year round with consistent results.
AC
Inlet filter
Dehumidifier
Heater
When I got my AC it was a game changer that i had been waiting for. Now its smooth sailing.
Remember the better in control your environment is, the less chance a gogo wants to come into the room. Mites etc; love hot, dry/ cold, humid. So you need to get the balance right.
Plus plenty of air movement.
I use a simple panel heater. The ones for bathrooms. I lay that flat in the room and run it on a humidistat so as to warm the room up to remove RH.
Also a thermostat is another good piece of tech to have. Just set it and forget it. You can even set your AC to run off of it so when its too hot it turns on the cool function which is powering the AC.