1. How often should I replace my HVAC air filter?
Generally, you should change your air filter monthly, or more frequently if you have pets, allergies, or high dust levels.
Changing filters regularly ensures optimal airflow and efficiency.

2. How can I tell if my HVAC system needs maintenance?
Your HVAC system should be serviced at least twice a year, once in the spring and once in the fall, says United HVAC Motors.
Signs that it needs maintenance include unusual noises, uneven heating/cooling, or changes in energy bills.

3. Why is my HVAC system so loud?
Loud noises can indicate various issues, such as a failing motor, loose components, or frozen evaporator coils, according to Rite Way of Phoenix.
Contact a professional to diagnose the specific cause of the noise.

4. What is SEER rating and why should I know about it?
The Seasonal Energy Efficiency Ratio (SEER) measures the amount of heating or cooling your system delivers per dollar spent on electricity, says Garrison; Garrison.
A higher SEER rating means more efficient and cost-effective operation.

5. How can I improve the efficiency of my HVAC system?
Regularly change your air filters, ensure proper insulation, and seal leaks in your home, according to H; H Heating and Air Conditioning Inc.
Consider installing a programmable thermostat and using ceiling fans when possible.

6. What are the signs that my HVAC system needs replacement?
Signs include frequent repairs, high energy bills, uneven heating/cooling, and noisy operation, according to Lennox.
Consider replacement if your system is old or has become consistently inefficient.