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Hello, tell me a lot about your technical skill sets so that I can coach you most effectively... and tell me please if the upstairs has always been a problem or if this is an entirely new phenomena.
We can go from there.
Its most likely a sticky damper or low on refrigerant problem.
Tell me which direction you are from the center of the nearest city and I will get you a short list of well rate HVAC service outfits in your area.