Getting a new AC installed and then finding it still doesn't cool properly is one of the most frustrating HVAC experiences a homeowner can have. In Texas, it's also more common than it should be. Here are the 5 most common causes of a new system that doesn't perform as expected — and your rights as a customer.
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Many contractors size replacement systems by 'matching tonnage' from the old unit — without doing a Manual J load calculation. The old system may have been oversized or undersized from original installation. Without a load calculation, a new system can have the same sizing problem as the old one.
💰 Cost: Demand a Manual J load calculation with any replacement quote
A new system must be charged to the exact manufacturer specification for your specific conditions. Overcharge or undercharge both reduce efficiency and cooling capacity significantly. This is a technician skill and attention issue — it requires proper gauges and calculation.
💰 Cost: Verify charge was set to manufacturer specification
A new high-efficiency system on old leaky ductwork will underperform. If your ducts leak 20–30% of air into the attic, even a perfectly installed new system can't compensate. Ask about duct assessment with any replacement.
💰 Cost: Duct leak test: $150–$300. Sealing: $300–$1,500
A new single-stage system in a home that needs two-stage for humidity control in Texas may cool to temperature but leave the home feeling clammy and uncomfortable. Performance isn't just about temperature — it's about humidity removal, which requires the right system type.
💰 Cost: Ask about single-stage vs. two-stage vs. variable speed for your home
A new system that doesn't perform to its rated specifications within the first 90 days should be addressed by the installing contractor under installation warranty. Document the problem in writing with temperature and humidity readings. AC Repair Expo guarantees our installations.
💰 Cost: Document performance issues immediately in writing
The most common reasons a new system underperforms: it was incorrectly sized without a load calculation, the refrigerant charge wasn't set correctly, existing duct leakage is limiting distribution, or the wrong system type was selected for your home's needs. All of these are installation or design errors that should be addressed by the contractor.
A Manual J load calculation is the engineering calculation that determines the correct AC system size for a specific home. It accounts for square footage, ceiling height, insulation levels, window area and orientation, local climate data, and occupancy. It's the only accurate way to size a replacement system. Any reputable contractor includes this before specifying equipment.
Document the problem with temperature readings at different times of day. Contact the installing contractor in writing (text or email creates a record) and describe the specific performance issue. Request a return visit to verify refrigerant charge, airflow, and system performance against rated specifications. If unresolved, request a second opinion.
Yes — AC Repair Expo Heating & Cooling Inc guarantees our installations. We perform Manual J load calculations on all replacement quotes, verify refrigerant charge to manufacturer specification, and stand behind our work. If a system we installed isn't performing to spec, we come back.
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1827 Riley Fuzzel Rd Suite C, Spring, TX 77386
Serving Harmony, Benders Landing, Legends Ranch, Imperial Oaks, Spring Trails, The Woodlands.
19507 Wied Rd Suite B, Spring, TX 77388
Serving Klein, Champion Forest, Vintage Park, Gleannloch Farms, Tomball, Cypress.
AC Repair Expo Heating & Cooling Inc — same-day diagnosis and repair across Spring TX, The Woodlands, Tomball, Klein, and North Houston. Honest diagnosis, fair pricing, licensed TACLB43277C.
Riley Fuzzel Rd: 1827 Riley Fuzzel Rd Suite C, Spring TX 77386 · Wied Rd: 19507 Wied Rd Suite B, Spring TX 77388
