I have recently had some renovation work done in my forty-plus year old rambler. It involved moving interior walls in one end of the house. In the process, the contractor (not an HVAC contractor) had to reroute supply and return ducts. The house originally had a supply and a return in each room (no returns in the bathrooms).
My concern is that instead of moving the return ducts, he simply capped them off. Instead of three returns and five supply vents in that end of the house we now have five supply and one return vent in an area of the house which is about 600sf. In the whole house we have thirteen supply registers and four returns.
All of the return vents in the house are about 5" x 13". Most of the old supply registers were that size too but some of the new ones and the bathrm ones are smaller.
When I spoke to the contractor's "Air Conditioning guy" about it he said we had plenty of supply volume. He said that if there was a supply shortage we would hear the ducts popping when the blower came on. He also said the heat exchanger would overheat and shut off automatically.
Do I have any reason for concern?