AC Repair San Antonio- Ducts Problems Undersized ducts are very common, particularly where air conditioning has been added to an existing forced-air system. When operating the system, check for uniformity of airflow at supply registers. Check the operation of return air registers. A piece of tissue is often needed to check that return registers are drawing properly. Check for a balance between supply and return registers. An absence of return registers or inadequately sized return registers are very common problems. Check for the extensive use of flexible ducts. Flexible ducts have far more friction loss than rigid ducts. Flex ducts can be used for branches but should never be used for main feed ducts. A detailed duct system analysis is beyond the scope of a home inspection, but poor system performance on an adequately sized air conditioner can often be traced to an undersized distribution system. Regular AC Repair San Antonio and maintenance is necessary to keep the system in excellent condition. Be very careful to ensure that the duct system feeds all parts of the home. Additions and renovations are sometimes not air conditioned. Watch for electric heat in a room. This may mean no ductwork and, consequently, no cooling. It is very expensive to add air conditioning to spaces that don't have ducts. You don't want to have to provide a client with air conditioning in rooms because you mistakenly told them that the entire house was air conditioned. Watch for houses with hot water heat that have had independent air conditioning systems added. These systems often don't cover the whole house. For minor or major problems hiring the AC Repair San Antonio professional would be the best option consider.