A/C Replacement & Optimization | Suntex Home Services (Houston, TX)
Suntex Home Services
(832) 617-5899
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A/C Replacement & Optimization in Houston, TX

Houston summers are brutal. We diagnose the whole system before recommending any equipment — so your new A/C actually fixes the problem.

  • Room-by-room load calculation on every job — no guessing on size
  • We test ducts & attic conditions before any recommendation
  • Financing available — fast approvals
  • Licensed & insured, Houston-area homeowners only
Manual J sizing Diagnose first Houston-area Licensed & insured
★★★★★

"Professional, thorough, and took the time to make sure everything was checked properly. Communication was clear the entire time."

Justin Carroll — Google Review

Book Your Assessment

We'll call or text to confirm your appointment

📅 Most appointments available within a few days
🔒 No spam. No pushy sales calls. Just a straight answer about your system.
Why Most Replacements Disappoint

Why "Just Replace the Unit" Often Fails in Houston

The AC equipment is only one part of the system. Here's what's usually overlooked.

📐

Oversizing — the silent problem

Rule-of-thumb sizing such as "X tons per square foot" does not account for the actual building load. An oversized unit short-cycles: it cools the air quickly, shuts off, and never runs long enough to remove humidity. The home feels clammy and uncomfortable even when the temperature reads correctly. Proper sizing requires a Manual J load calculation.

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Duct problems don't go away

A new high-efficiency unit installed into a duct system with high static pressure, undersized returns, or leakage will perform exactly like the old one — because the constraint is in the ducts, not the equipment. We test static pressure and airflow before recommending any replacement. See: Duct Design & Replacement.

🌡️

Attic heat overwhelms new equipment

High attic and ceiling heat gain can add substantially to the cooling load, especially when insulation is thin or uneven. If attic conditions are a measured part of the problem, addressing radiant heat transfer, insulation, or air leakage may be appropriate alongside equipment work.

Our Process

How We Approach AC Replacement

We don't start by selecting equipment. We start by understanding what the home actually needs.

1

Diagnose the Whole System

We test static pressure, airflow, duct leakage, attic conditions, and insulation levels. We verify that replacement is actually the right answer — and if duct or attic work should happen alongside it. Learn about our assessment.

2

Manual J Load Calculation

We calculate the actual cooling load for your home based on square footage, ceiling height, insulation levels, window area, orientation, and occupancy. This determines the correct equipment size — not a rule of thumb.

3

Address Duct and Attic Issues First

If duct corrections or attic improvements are warranted, we sequence them correctly — so the new equipment operates in a system that's ready for it. A new unit installed into a fixed system performs like a different machine.

4

Install to Manufacturer Specs

We install to manufacturer specifications — correct refrigerant charge, proper airflow across the coil, verified electrical connections. Shortcuts in installation cost efficiency and equipment life. We verify performance before the job is closed.

Honest Guidance

When Replacement Is the Right Answer — and When It Isn't

✓ Replacement makes sense when:

✓The system is 12–15+ years old and has documented efficiency decline or increasing repair costs
✓The equipment is genuinely undersized for the home — a Manual J shows the load exceeds capacity
✓A major failure is expensive relative to the equipment’s remaining life, condition, warranty, and replacement options
✓The system uses R-22 refrigerant, which is no longer manufactured and increasingly expensive to service

→ Not the first fix when:

→The comfort problem is caused by duct issues or attic heat — a new unit in the same system won't fix either
→The system is under 8 years old and functioning — there may be a better fix that costs significantly less
→You haven't had a diagnostic yet — we won't recommend replacement without testing the system first
Common Questions

A/C Replacement FAQs

Should I repair or replace my AC unit?+
Repair-versus-replace depends on the specific failure, repair cost, equipment age and condition, refrigerant and parts availability, warranty status, efficiency, and whether the system is correctly sized for the home. We diagnose the failure and the rest of the system before recommending replacement.
What is Manual J and why does it matter?+
Manual J is the ACCA standard for residential load calculation — it determines the correct equipment size based on your home's actual characteristics (square footage, insulation, windows, orientation, occupancy). Oversizing can contribute to short cycling and humidity-control problems, while undersizing can limit capacity under design conditions. We size replacement equipment from a room-by-room load calculation rather than tons-per-square-foot rules of thumb.
What SEER rating should I get?+
Federal minimum efficiency requirements in Texas vary by equipment type, cooling capacity, and the certified matched-system combination. Efficiency rating is only one part of equipment selection. We compare the matched system rating, load, staging, expected runtime, duct performance, comfort goals, utility costs, warranty, and budget before recommending an efficiency tier. We recommend the equipment that best fits the measured load, system conditions, comfort goals, and budget.
How long does AC replacement take?+
A standard split system replacement typically takes 4–8 hours. If duct modifications are included, add time depending on scope. We confirm timeline and scope before scheduling so there are no surprises on install day.
Will a new AC unit fix my high electric bill?+
Only if the bill is driven by equipment inefficiency. If the cause is attic heat load, duct leakage, or poor insulation, a new unit will have similar bills within the first summer. That's exactly why we measure the whole system before recommending replacement.

Duct Design & Replacement

We evaluate duct performance as part of replacement planning when airflow or static pressure may be a constraint, so a new system is not connected to an unresolved distribution problem.

Learn More

Radiant Barrier & Insulation

Reducing attic heat load before or alongside replacement dramatically changes how the new equipment performs.

Learn More

Home Energy Assessment

Every replacement recommendation we make starts with a diagnostic — static pressure, attic conditions, and load calculation.

Learn More
★★★★★
"Professional, thorough, and took the time to make sure everything was checked properly. Communication was clear the entire time — you can tell they genuinely take pride in their work."
Justin Carroll — Google Review

Not sure if you need a new AC — or something else?

We diagnose the whole system before recommending equipment. You'll know exactly what the problem is before you commit to anything.

(832) 617-5899
Service areas for A/C Replacement
Houston Cypress Katy The Woodlands Spring Tomball Humble Atascocita Jersey Village Conroe Magnolia