We recommend changing your air filter every three months. If you have multiple pets or live in an area with high levels of dust or dander, you may need to replace it more often.

To prevent unexpected breakdowns, we recommend scheduling professional maintenance twice annually—once before the cooling season in spring and once before the heating season in fall.

Selecting the correct unit size requires careful evaluation and isn't a simple calculation. Several factors must be considered, including your home's design, total square footage, wall construction, insulation levels, attic characteristics, and other variables. An oversized system can create excess humidity, potentially causing moisture problems and mold growth. An undersized system will run constantly, driving up your utility bills. A qualified HVAC technician is the only person who can properly determine the right unit size for your specific home.

Operating a heat pump typically costs about 50% less than running an electric heating system. To learn more about the various heating and air conditioning systems available to St. Peters, MO homeowners, contact us today.

In most cases, yes. Several important factors support replacing both units simultaneously. Outdoor units for air conditioners and heat pumps are engineered to work best with a matching indoor unit. If your indoor and outdoor units were installed together, the indoor unit is likely approaching the end of its useful life at approximately the same time as the outdoor unit. Choosing to keep the old indoor unit simply delays an inevitable replacement and may lead to increased energy expenses. Purchasing both units together provides you with a warranty covering the complete system, protecting you from the full cost of any covered components throughout the warranty period.

Most HVAC systems have a lifespan of 10 to 15 years. As your system ages, it loses efficiency and performance declines. According to energy.gov, air conditioners account for approximately six percent of all electricity consumed nationwide, making efficiency critical. For this reason, you should consider replacement after about 10 years of service. Even without significant malfunctions, newer HVAC systems will reduce your energy expenses through improved efficiency. Additionally, they typically include 10-year warranties, providing long-term protection. As one of the trusted heating and cooling companies serving St. Peters, MO, CNO Comfort Zone Heating and Cooling can install the right HVAC system for your home.

Your boiler should be flushed and calibrated annually, preferably before cold weather arrives, to maintain efficient operation throughout the heating season.

When you receive your new unit, be sure to register it with the manufacturer to activate warranty coverage. The manufacture date appears on a label attached to the exterior of your equipment. If your unit is less than five years old, warranty coverage is likely still in effect. Contact us and we can verify your active warranty status and provide complete details.

Heating and cooling systems represent substantial investments, making proper care essential. To minimize wear, adjust your thermostat settings when the home is unoccupied. Changing air filters regularly prevents system strain from restricted airflow, and scheduling routine maintenance with an HVAC professional helps identify and resolve potential issues before they become serious problems.

Your HVAC system may require repairs or replacement if you observe any of these warning signs: Unusual odors such as mold, mildew, burning smells, or decomposition, which can indicate anything from dead animals in ductwork to failing components. Poor air quality, including incorrect temperatures or insufficient airflow, suggesting various potential system malfunctions. Abnormal sounds like banging, clanging, humming, rattling, buzzing, or clicking that typically indicate internal component failures. Electrical issues, including failure to start, inability to shut down, or rapid cycling on and off, which usually point to electrical system problems.