Heating and cooling

Manufactured homes often use equipment specifically designed and certified for them, particularly furnaces. That matters: a furnace not listed for manufactured-home use may be unsafe and may void insurance. If a system is being replaced, confirm the replacement is approved for this application.

Ductwork usually runs in the belly of the home, below the floor, which creates a failure mode houses do not have. Ducts come loose at joints, get crushed, or are torn open by animals, and the system then heats and cools the crawl space instead of the home. Rooms that never reach temperature, or a system that runs constantly, frequently means a duct problem rather than an undersized unit.

Service the system annually. Change filters on the schedule the manufacturer specifies, restricted airflow is the most common cause of both poor performance and premature failure. Keep the outdoor unit clear of vegetation and debris.

Have the duct run inspected periodically as part of a crawl-space check. Reconnecting and sealing ducts is inexpensive relative to what it saves on a system that has been conditioning the outdoors.

If you have a fuel-burning appliance of any kind, fit carbon-monoxide alarms and test them. This is not optional advice.