Hello, typing from Southern California where it doesn't get as cold as NE winter but our heating only blows out lukewarm to cold air since we moved in. The thermostat doesn't increase more than 1 or 2 degrees no matter how long the heat is on. We had a professional come out who couldn't identify a problem. We use space heaters but it's not a long-term solution with aging parents. House inspector noted "TYPE : Central electric heat pump (Hydronic hot water system) SIZE : 2Ton & AGE : 1990 (manufacture date). Comment: Heating system did not operate. Unit runs, though was not producing heat. Cause was not determined, though repair is needed."

Per my limited understanding, air is being warmed as it circulates past hot water then continues to the duct system. We have a 3 year old direct vent natural gas water heater installed in an outside closet that occasionally experiences a weak pilot light but otherwise normal operation. Could that pose an issue?

Appreciate any advice and/or diagnosis on what could be wrong.