New here been researching but wanted to hear some other opinions before contacting ouf plumber/contractor. We have radiant in entire first floor and forced air on the 2nd floor in our home. It's the original slab foundation and the home had the old copper tube radiant which worked great but was a few decades old. We've upgraded to pex radiant but have been have issues with uneven heating and it's pretty bad when the temps dip into the 20s. We have had the plumber here a few times trying to balance the manifold adjust with very little success. He asked why we didn't tie the downstairs into the hvac to also have forced air as a supplement to the radiant on cold days. The old radiant felt warmer and the house wasn't insulated as well as it is now. We have spent a good amount on this system and feel it should work as good or better than the old copper system we had. And if it was going need supplemental heat from the hvac system then the plumber should have suggested that in the beginning. They have suggested tying downstairs into the system to add forced air to the downstairs area. The cost didn't seem too bad but we feel they should cover the costs of that. In my research the possible cause might be the loop runs are too long. Hard for us to know but I've attached some pics. The main living room /kitchen area is 32x14 and the master bed is 14x21.
