For a long time, I struggled a great deal with keeping the hot & cold temperatures in my whole property even.
If the upper rooms were not too especially warm in summer, then the lower rooms were super chilly in winter.
For some reason, there never seemed to be a proper balance no matter how much I installed independent control units. The property would become too uncomfortable for pretty much everyone while in these particular seasons. This went on for a bunch of years until I finally managed to figure a way out. It is honestly possible to have the entire dwelling totally comfortable for everyone, regardless of where they are at any unique time or season. My Heating, Ventilation & A/C supplier easily suggested that myself and others get a zoning system. Experts in the Heating, Ventilation & A/C industry often will suggest going for splitting the system. I made the choice to go with the numerous temperature control units instead of the electronically controlled dampers in the HVAC duct. This move totally solved the issue of uneven heating across the entire property. If doing this does not work for your home, you need to find the underlying problem & service it before anything else. It is possible that even with a zoned system, the issue of uneven heating & cooling can still be a problem. In such cases, then other complications are truly responsible for the issue. Potential reasons include blockers; the fan is turned off, blocked soffit vents, & insufficient attic insulation. Whatever the case may be, hiring an experienced Heating, Ventilation & A/C equipment worker is highly recommended. Make sure air flows entirely freely through the system with no internal or external clogs. Also, confirm that there are no leaking ducts on the higher floor as this could cause air loss. When it comes to insulation, make sure to go for the most modern technology, meaning that ancient properties should be repaired.