A local Plumbing contractor says the following:
?In the case of a central heating and air conditioning system, closing off vents has the same effect as a dirty air filter. It simply restricts airflow. Heating systems are designed to heat the whole home and are sized accordingly. Shutting off a section of airflow increases the air pressure in the system, in turn increasing the amount of duct work leakage."
"A more energy efficient way to control individual temperatures in unused rooms is by using a ductless heating and cooling mini split systems that are mounted on the wall and wired using a simple wiring process to an outdoor unit. No ducts are used so installation doesn?t take much time at all. Ductless heating and cooling mini split systems are a flexible solution.?
My question: Is closing the ducts to three unused bedrooms and an unused bathroom a bad idea and it won?t save any money on the gas bill?