08/08/2025
You know you are never to old to learn something when it comes to the HVAC system in your home. If you’re replacing both your furnace and air conditioner, it’s generally a very good idea to replace the A-coil at the same time. Here's why, along with other key tips to keep in mind:
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✅ Why Replace the A-Coil?
The A-coil (evaporator coil) is the part of the AC system that sits on top of or inside your furnace and is responsible for absorbing heat from your home. Reasons to replace it:
1. Compatibility: New AC condensers (the outside unit) often use different refrigerants (like R-410A) than older systems (like R-22), and the A-coil must match the refrigerant and capacity.
2. Efficiency: A mismatched system can lower SEER ratings and efficiency, which can cost you more in utilities.
3. Warranty: Most manufacturers require that all matching components (including the A-coil) be installed to honor the warranty.
4. Clean Slate: Older coils may already have corrosion or leaks. Replacing it ensures system longevity and performance.
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🔧 Tips When Replacing Furnace and AC
1. Size the System Properly
• Bigger isn’t better. Have a licensed HVAC contractor perform a Manual J load calculation to size your system accurately based on your home’s insulation, windows, layout, and more.
2. Consider High-Efficiency Units
• High-efficiency systems (95%+ furnace, 16+ SEER AC) can qualify for rebates and offer long-term energy savings.
• Weigh upfront cost vs. long-term utility savings.
3. Replace Both Units Together
• Furnace and AC share components like the blower and controls. A new AC with an old furnace blower may undermine performance.
4. Upgrade the Thermostat
• Consider a smart or programmable thermostat for better efficiency and comfort control.
5. Inspect Ductwork
• Leaky or poorly sized ducts can reduce system efficiency by up to 30%.
• Seal and insulate ducts where needed.
6. Verify Permits and Inspections
• Ensure the contractor pulls proper permits and schedules inspections—this protects your home value and safety.
7. Compare Warranties and Rebates
• Look for 10-year parts warranties and labor warranties if available.
• Check for utility company rebates or tax credits (especially if upgrading to high-efficiency or heat pump systems).
8. Ask About Maintenance Plans
• Some companies offer annual service agreements that can keep your system running well and maintain warranty compliance.
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Final Thought....If you’re replacing both the furnace and AC, not replacing the A-coil is like putting old tires on a new car—it may work, but you’re risking performance, efficiency, and longevity. Replace it as part of the system upgrade.
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