Monitor your energy costs
In addition to your regular monthly payments, you should keep an eye on your power bill for unexpected increases. Reduced energy efficiency due to a faulty component can force your HVAC system to work harder than usual to heat and cool your home, consuming more energy.
You should check the air filters and the condensate drain, and remove any obstructions around your HVAC equipment if you notice an unexplained increase. If the problem has not been resolved by the end of the month, let's contact a professional.