9 Tips to Improve Your HVAC System’s Efficiency

An efficient HVAC (heating, ventilation, and air conditioning) system is crucial for providing a comfortable indoor home environment. As per the US Department of Energy, heating and cooling accounts for over half of the energy use in a typical US home, making HVAC systems the largest energy expense for most homeowners. Inefficient HVAC systems can waste energy and cost homeowners hundreds of dollars per year in utility bills. 

While HVAC systems become less efficient as they age, proper maintenance and upgrades can restore performance. Even new systems may not be optimized for efficiency. Fortunately, there are several ways homeowners can improve the efficiency of their existing HVAC systems. Even small upgrades and adjustments can lead to significant energy savings over time. 

The tips below will help you maximize efficiency regardless of your HVAC system’s age.

Air filters play a vital role in HVAC efficiency. As filters become clogged with dust and particles, they restrict airflow through the system. It forces the system to work harder to keep up with heating and cooling demands. Most experts recommend changing filters every 1-3 months. High-quality pleated filters capture more particles and may not need changing as frequently.

Regularly changing filters allow air to flow freely and reduce strain on system components. This simple maintenance task can lower energy consumption by 5-15%. It also keeps indoor air cleaner by preventing dust buildup inside air ducts.

  • Upgrade to a High-Efficiency HVAC System

If your HVAC system is over ten years old, upgrading to a high-efficiency system may be the best way to maximize energy savings. Thanks to technological advancements, today’s systems are significantly more efficient. Additionally, ductless heating and cooling systems are becoming increasingly popular due to their efficiency and ease of installation, especially in homes where ductwork might be challenging.

The minimum SEER (Seasonal Energy Efficiency Ratio) rating for new air conditioners is 14. High-efficiency models now go as high as 19 SEER. The Department of Energy estimates replacing an old 10 SEER unit with a new 15 SEER unit saves up to 20% in cooling costs.

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Similarly, modern furnace efficiency ratings of 90% AFUE (Annual Fuel Utilization Efficiency) or more have replaced older models rated at 60-80% AFUE. Upgrading your HVAC system is a major investment but can pay for itself over 5-10 years in energy savings.

  • Have Your HVAC System Professionally Serviced Annually

In addition to regular filter changes, having an HVAC technician perform annual maintenance helps ensure peak efficiency. They’ll thoroughly inspect the system and identify any component wear or damage affecting performance. Common recommendations may include:

  • Checking refrigerant charge and topping it off if low
  • Cleaning evaporator and condenser coils 
  • Testing electrical components and tightening connections
  • Lubricating moving parts
  • Clearing drain lines to prevent clogs

This professional tune-up ensures that all aspects of your HVAC system are doing their best for the heating and cooling seasons. 

  • Seal Air Leaks in Your Home

Sealing air leaks prevents conditioned air from escaping and unconditioned air from entering. 

The Department of Energy estimates homeowners can save 10-20% on heating and cooling costs by sealing air leaks. Using caulk and weatherstripping is advised to seal gaps and openings. Also, ensure attic hatches and pull-down stairs are properly insulated and sealed. Stopping air leaks takes the pressure off your HVAC system, so it doesn’t have to work as hard.

  • Insulate Attics, Basements, and Crawlspaces 

Insulation is a barrier to heat flow and is key to an efficient HVAC system. Having inadequate insulation in attics, crawlspaces, and unfinished basements forces your heating and cooling system to work overtime.

Adding insulation to meet current code recommendations for your region can save up to 20% on heating and cooling costs. Ensure insulation in your attic covers joists fully and is evenly distributed. Use foam sealants on rim joists in basements and crawlspaces before insulating. Your HVAC system will maintain temperatures more easily in a well-insulated home.

  • Install a Programmable or Smart Thermostat

One of the easiest ways to boost HVAC efficiency is upgrading your thermostat. Programmable models allow you to set customized heating and cooling schedules. It prevents the system from running when not needed. 

Smart thermostats take this further by optimizing run times based on home occupancy patterns and self-adjusting to maintain comfort. Features like geofencing and integration with smart home devices make them more energy efficient.

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Programmable and smart thermostats can reduce heating and cooling usage by 10-30%. 

  • Have Ductwork Professionally Sealed

If your home has a forced-air HVAC system, sealing ductwork prevents conditioned air from leaking before reaching vents. The Department of Energy estimates 20-30% of air moving through duct systems is lost due to leaks.

Professional duct sealing involves using adhesives and sealants to close gaps and connections in the ductwork. Ensuring ducts are airtight makes your system more efficient and comfortable. It also prevents dust and allergens from entering through leaks.

If accessible, inspect the ducts yourself for obvious disconnects and tears before calling a professional. Sealing ductwork can lower heating and cooling costs by up to 20% annually.

  • Improve Ventilation and Air Circulation

Proper ventilation and air circulation ensure that conditioned air is evenly distributed throughout your home. Restrictions in the ductwork, closed interior doors, and insufficient return air vents can lead to hot/cold spots and force HVAC systems to work harder.

Ensure air can flow freely under interior doors or install return air vents in each room. Ensure supply and return vents are unobstructed by furniture or objects. You can also install ceiling fans to improve air circulation in stagnant areas. Letting air move freely takes excess pressure off your HVAC system.

  • Schedule an Energy Audit

If you’ve addressed the improvement tips above, but your HVAC system still seems inefficient, it may be time to schedule an energy audit. An energy auditor will perform comprehensive testing and inspections to pinpoint areas of poor performance.

Common problems identified include inadequate ductwork, insufficient insulation, and system components mismatched to your home’s needs. An energy auditor can model the costs and benefits of specific upgrades to help you prioritize improvements with the best return on investment.


Keeping your HVAC system running requires regular maintenance and staying on top of upgrades as components age. While the tips above require time and money, they pay dividends through lower energy bills and improved comfort year after year. Don’t wait until your system stops working to take action. Schedule service calls before cooling and heating seasons, upgrade components, and promptly address air leaks or insulation issues. With some diligence, you can optimize your HVAC system to provide maximum comfort for your home while minimizing energy costs.