A heating and cooling system usually gets attention only when it stops working. By then, the house is uncomfortable, the repair may cost more, and the appointment calendar is suddenly urgent. Regular care helps prevent that scramble. HVAC systems work hard through heat, cold, humidity, dust, pet hair, and daily use. The parts inside collect debris, electrical connections loosen, drains clog, filters load up, and motors wear over time. None of that is unusual. The problem star