When I am ready to do our Heating plus Air Conditioning tune up plus check up the few times of year that I have them done, I always call the heating plus air conditioner company in advance; Usually a month in advance to schedule our turn up plus check up of the central heat plus cooling system unit. The reason I do this is to guarantee that I will be able to get Heating plus Air Conditioning apartment services from the local heat plus cooling system company. When you call only a few days to a month out, what happens is you take the risk of them not being available or booked up plus it could be weeks before they can get a heating plus air conditioner specialist out to your apartment to do the heat plus cooling system tune up. They do not treat it care about heating plus cooling repair. So I have found that calling a month in advance is the best way to go. I called this month just a few days ago to schedule our Heating plus Air Conditioning tune up plus check up for this time next month, which is the beginning of the Summer time months. And it is going to be a sizzling a single this year. So I want to make sure that our central heating plus cooling system is all up-to-date plus working properly to avoid any kind of heat plus cooling system breakdowns in the middle of a heatwave. I had that happen to me once plus it was not fun.