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Questions and Answers
What are the permit and safety requirements for installing a new AC unit with the latest refrigerant?
All HVAC replacements in O'Fallon require a permit from the City Planning and Development Department. Since 2025, new systems predominantly use mildly flammable A2L refrigerants like R-454B. Installations must follow updated safety codes requiring leak detectors, specific circuit breakers, and improved ventilation in mechanical rooms. These standards ensure safe operation and are verified during the municipal inspection process.
My AC seems to run constantly but barely cools. Could its age be the main factor?
Systems installed around O'Fallon's 1999 average build year are now 27 years old, exceeding typical service life. With age, refrigerant charge can leak and internal components like capacitors wear out, reducing capacity. A primary failure point here is the condensate drain line, where algae clogs form due to our humid continental climate. This backup can trigger a safety switch that shuts the system down entirely.
Why does my air conditioner struggle to keep up on the very hottest days we get?
O'Fallon's HVAC systems are engineered to a 92°F design temperature, balancing efficiency and cost. On days exceeding that, such as during regional heatwaves, the system must run continuously to narrow the temperature gap, which is normal operation. Modern units using R-454B refrigerant maintain better efficiency and capacity at these higher ambient temperatures compared to older R-410A systems.
I use gas heat now. Is a heat pump a practical primary heating system for our Missouri winters?
Modern cold-climate heat pumps are effective in O'Fallon, where winter lows typically dip into the teens. They provide efficient heating down to about 5°F, with a gas furnace or electric strips as backup for extreme cold. To maximize savings, use the heat pump during off-peak hours and minimize operation during the utility's peak period from 2 PM to 7 PM when electricity rates are highest.
Our AC just stopped blowing cold air on a hot afternoon in the Renaissance area. How quickly can a technician arrive?
For a no-cool emergency near the Renaissance subdivision, dispatch from our service center near O'Fallon City Hall provides a reliable 10 to 15 minute response. Technicians take I-64/US-40 for direct access, allowing a prompt diagnosis. Common immediate checks include verifying the thermostat setting, checking the circuit breaker, and ensuring the outdoor condenser unit is clear of debris.
My Ecobee thermostat is showing an 'E1' error code. What does this mean for my system?
An Ecobee E1 alert indicates the thermostat is not detecting a signal from your HVAC equipment, often due to a safety lockout. In O'Fallon, this frequently results from a clogged condensate drain line triggering the system's float switch. It can also signal a failed control board or a tripped breaker. This error proactively prevents water damage but requires a technician to clear the blockage or diagnose the electrical issue.
What does the new 14.3 SEER2 minimum efficiency standard mean for my replacement costs and bills?
The 14.3 SEER2 mandate effective January 2023 ensures new systems use significantly less electricity. At O'Fallon's average rate of $0.13 per kWh, upgrading a 3-ton unit from an old 10 SEER model can save hundreds annually. The active Inflation Reduction Act rebates, with an $8,000 cap for qualified heat pumps, can offset much of the higher upfront cost of these efficient systems.
Can my home's existing ductwork support a better air filter to help with spring pollen and ozone?
Upgrading filtration can address May pollen peaks and regional ozone risks. Your insulated galvanized steel ducts are generally robust, but adding a high-MERV filter like a MERV-13 creates higher static pressure. A technician should measure your system's static pressure to ensure the blower motor can handle the restriction without reducing airflow or causing premature failure.
