HVAC Frequently Asked Questions by mid cities metal ducts

Please reach us at jacob@mcmdinstall.com if you cannot find an answer to your question.

Should I repair or replace my HVAC system?

A good rule: if the system is over 10–12 years old and repairs cost 30–50% of replacement, replacement is often the smarter long-term choice.

How often should I have my heating and air conditioning serviced?

For most residential systems we recommend preventative maintenance twice a year.

for commercial application a quarterly maintenance schedule is recommended.

What size HVAC system do I need?

System size depends on square footage, insulation, ductwork, windows, and climate. A professional load calculation is required—bigger is not better.

pro tips by mid cities metal ducts

Change Filters More Than You Think

A dirty filter is the #1 cause of HVAC issues. Check it monthly and replace it every 1–3 months to keep airflow strong and energy bills down.

Don’t Oversize Your System

Bigger isn’t better. An oversized unit short-cycles, wastes energy and causes uneven comfort. Always size systems using a proper load calculation.

Seal and Insulate Ductwork

Leaky or poorly insulated ducts can waste 20–30% of conditioned air. Well-built metal ductwork makes a huge difference in comfort and efficiency.

Keep Outdoor Units Clear

Maintain at least 2 feet of clearance around condensers. Leaves, grass and debris force the system to work harder and shorten equipment life.

Schedule Preventive Maintenance

Spring and fall tune-ups catch small problems before they become expensive repairs—and help your system last years longer.

Use a Smart or Programmable Thermostat

Proper thermostat settings can save 10–15% on energy costs while keeping your home comfortable when you’re there.