Plano sits at the heart of Collin County, one of the fastest-growing and most affluent suburbs in the Dallas-Fort Worth metroplex. Homes here tend to be larger than older DFW stock, AC runs five to six months at near-full capacity, and a large cohort of systems installed in the 1990s and 2000s is now reaching the end of its useful life. If you are pricing an HVAC replacement in 2026, this guide covers what you will actually pay, how to claim Oncor rebates, and what a Plano home needs to stay comfortable through triple-digit Texas summers.
TL;DR: Plano HVAC replacement costs $5,500-$14,500 in 2026 depending on system type and home size. Plano is in Climate Zone 2A (hot Texas summers with heat index regularly above 105 degrees Fahrenheit). Oncor’s Home Energy Efficiency program offers $400-$600 back on qualifying equipment (program open January through November). The City of Plano requires a mechanical permit for all replacements; permit fees typically run $100-$300. Most Plano homes need a 3.5 to 5 ton system. Get your personalized estimate here.
What Does HVAC Replacement Cost in Plano, TX?
Plano HVAC prices run slightly above the DFW average, primarily because Collin County homes are larger on average than older Dallas and Fort Worth neighborhoods. A 2,500 square foot Plano home from the 1990s typically needs a 4-ton system, not the 3-ton unit that might suffice in a smaller mid-century Dallas home. Here are typical installed costs for 2026:
| System Type | Typical Range (Installed) | Notes |
|---|---|---|
| Central AC only (3.5 ton) | $5,500-$9,800 | Smaller Plano homes, existing ductwork |
| Central AC only (4-5 ton) | $7,500-$12,500 | Common in larger Collin County homes |
| Full system: AC + gas furnace | $6,200-$13,800 | Most common full replacement in Plano |
| Heat pump system | $6,800-$14,500 | Qualifies for highest Oncor rebate tier |
| Dual-fuel (heat pump + gas furnace) | $8,800-$16,500 | Best cold-weather resilience for Zone 2A |
| Mini-split (per zone) | $3,500-$7,500 | Bonus rooms, home offices, additions |
These ranges assume existing ductwork in good condition. Many Plano homes built between 1990 and 2005 have flex duct systems that are now 20 to 30 years old. Degraded flex duct reduces system efficiency, causes comfort complaints (hot rooms, uneven temperatures), and often needs replacement at the same time as the equipment. Ductwork replacement adds $3,500 to $8,000. When in doubt, ask your contractor to inspect the duct system as part of their assessment, not just quote the equipment replacement.
Oncor Rebates: How Much Can Plano Homeowners Save?
Oncor Electric Delivery is the distribution (wires) company for most of Plano and Collin County. Through its Home Energy Efficiency (HEE) Standard Offer Program, Oncor offers direct rebates on qualifying high-efficiency HVAC equipment installed by approved contractors. The 2026 program runs January through November. Rebates are applied as a direct discount on your contractor’s invoice.
| Equipment | Rebate Amount | Minimum Efficiency |
|---|---|---|
| Central AC (SEER2 16.0-16.9) | $400 | SEER2 16.0, EER2 11.7 |
| Central AC (SEER2 17+) | $550 | SEER2 17.0+ |
| Heat Pump (SEER2 16.0-16.9) | $425 | SEER2 16.0, HSPF2 7.5 |
| Heat Pump (SEER2 17+) | $600 | SEER2 17.0+ |
| Smart Thermostat | $75 | ENERGY STAR certified |
| Duct Sealing (Aeroseal) | $250 | Licensed contractor required |
Texas uses retail electric choice, so your retail electric provider (TXU Energy, Reliant, Green Mountain, etc.) is separate from Oncor. Oncor is your distribution company. Some REPs offer their own equipment rebates on top of the Oncor rebate. Check your electric bill to confirm Oncor is your wires company before requesting the rebate. Some portions of Collin County are served by CoServ instead of Oncor; CoServ offers $400 for central AC (SEER2 16+) and $500 for heat pumps (SEER2 16+).
Oncor rebates require using an approved Service Provider. Ask any contractor you are evaluating for their Oncor provider ID. The contractor submits paperwork to Oncor and the rebate comes off your invoice rather than arriving as a separate check weeks later. Rebate funds are awarded first-come, first-served within the program year, so scheduling earlier in the year is preferable.
Note: The federal Section 25C Energy Efficient Home Improvement tax credit expired on December 31, 2025. It is not available for 2026 installations as of this writing. See our HVAC tax credits and rebates page for the latest status on federal incentives. For current rebate amounts and stacking strategies for North Texas homeowners, see this Texas HVAC rebates guide.
What Size HVAC System Does a Plano Home Need?
Most Plano homes need 3.5 to 5 tons of cooling capacity, larger than national averages, because of the Zone 2A climate and Collin County’s larger-than-typical home sizes. Plano sits in ASHRAE/DOE Climate Zone 2A (hot-humid), a designation that requires more powerful HVAC systems than homes in the northern or mountain states. The DFW area sees approximately 2,756 cooling degree days annually, more than twice the national average, meaning your air conditioner runs far more hours per year than in most other US markets.
Collin County homes also tend to be larger than older DFW stock. The build-out boom of the 1990s through 2010s produced many 2,200 to 3,500 square foot homes in Plano, Frisco, and McKinney. Those homes need appropriately sized systems:
| Home Size (sq ft) | Typical System Size | Notes for Plano |
|---|---|---|
| Under 1,400 | 2.5-3 ton | Smaller condos or older patio homes |
| 1,400-2,000 | 3-3.5 ton | Typical 1980s-1990s Plano starter home |
| 2,000-2,600 | 3.5-4 ton | Most common replacement size in Plano |
| 2,600-3,400 | 4-5 ton | Larger Plano and West Plano homes |
| Over 3,400 | 5+ ton or zoned | Multi-zone or dual-system often more efficient |
These are rough guidelines. The correct system size for your specific home depends on insulation levels, window area and orientation, ceiling height, duct condition, and local microclimate. The right way to size a system is a Manual J load calculation. Ask any contractor you are evaluating to provide this documentation. If they quote you a system size without performing or referencing a load calculation, push back.
Do I Need a Permit for HVAC Replacement in Plano? What to Ask Contractors
The City of Plano requires a mechanical permit for all HVAC replacements (Ordinance No. 2025-11-4, effective Jan 2, 2026), including like-for-like swaps of the same system type and capacity. Permit fees are calculated based on project value and typically run $100 to $300 for a standard residential replacement. The city’s Building Inspections department (phone: 972-941-7143) processes permit applications in approximately 2 business days. Online permit applications are available through the city’s portal.
Plano and the broader Collin County market have a large number of HVAC contractors ranging from small owner-operators to large regional firms. Competition is strong, which is good for homeowners. That said, the high volume of new installations in the area also means some contractors cut corners on sizing, ductwork inspection, or permit compliance. Here is what to confirm before signing a contract:
- Confirm the contractor is an Oncor-approved Service Provider if you want the HEE rebate (ask for their provider ID)
- Confirm the permit is included in the quoted price and will be pulled before work begins
- Ask for the Manual J load calculation, not just a rule-of-thumb size estimate
- Get equipment model numbers and SEER2 rating confirmed in writing before signing
- Confirm what the warranty covers: manufacturer parts warranty plus the contractor’s labor warranty duration
- Ask whether duct inspection and sealing is included or priced separately
Never hire a contractor who offers to skip the permit to save money or speed up the job. An unpermitted HVAC installation in Plano can affect your homeowner’s insurance coverage and create disclosure issues when you sell. A permitted installation includes a city inspection that confirms the work is code-compliant. For more detail on evaluating bids and knowing when repair makes more sense than replacement, see our repair vs. replace HVAC guide and how to read HVAC quotes. For a statewide comparison across all Texas markets, see the Texas HVAC replacement cost guide.
Frequently Asked Questions
How much does HVAC replacement cost in Plano, TX?
Plano homeowners typically pay $5,500 to $14,500 for HVAC replacement in 2026. Central AC-only replacement runs $5,500 to $9,800 (3.5 ton, existing ductwork). A full system (AC plus gas furnace) runs $6,200 to $13,800. A heat pump system runs $6,800 to $14,500. Plano homes are typically larger than the DFW average, which pushes most replacements toward the mid-to-upper portion of those ranges. Use our HVAC cost estimator for a personalized range based on your home size and system type.
Does Oncor offer rebates for HVAC in Plano?
Yes. Oncor’s Home Energy Efficiency program offers $400 to $600 back on qualifying equipment, available January through November. You must use an Oncor-approved contractor. The rebate is applied as a direct discount on your invoice. Key amounts:
- Central AC at SEER2 16.0 to 16.9: $400
- Central AC at SEER2 17 or higher: $550
- Heat Pump at SEER2 16.0 to 16.9: $425
- Heat Pump at SEER2 17 or higher: $600
- ENERGY STAR smart thermostat: $75 additional
Parts of Collin County near Plano are served by CoServ rather than Oncor. CoServ offers $400 for AC (SEER2 16+) and $500 for heat pumps (SEER2 16+). Check your electric bill to confirm your distribution company before requesting the rebate.
Do I need a permit for HVAC replacement in Plano?
Yes. The City of Plano requires a mechanical permit for all HVAC replacements. Permit fees are value-based and typically run $100 to $300 for a standard residential replacement. The city processes applications in approximately 2 business days, and an inspection is required after installation. Licensed contractors include the permit in their quote and handle the application. Do not skip the permit: unpermitted work can affect your insurance coverage and creates problems when you sell the home.
What size HVAC system does a Plano home need?
Most Plano homes need more cooling capacity than national averages suggest because of the Zone 2A climate and the larger-than-average home sizes common in Collin County. A 2,000 square foot Plano home typically needs 3.5 to 4 tons. A 2,600 square foot home usually needs 4 to 4.5 tons. Always request a Manual J load calculation from your contractor before agreeing on system size. Contractors who skip this step and size by rough square footage estimates frequently install systems that are either undersized (runs constantly in summer) or oversized (short-cycles and leaves the home humid).
Should I get a heat pump or gas furnace and AC in Plano?
Both options work well in Plano. Gas furnace plus central AC remains the most common combination in North Texas and is typically the lower upfront cost. A heat pump works efficiently in Zone 2A because Plano winters are mild enough (design low around 27 degrees Fahrenheit) for an air-source heat pump to operate without continuous electric resistance backup. Heat pumps also qualify for the higher Oncor rebate tier ($425 to $600 versus $400 to $550 for central AC). A dual-fuel system pairing a heat pump with a gas furnace backup gives you the best of both: heat pump efficiency for mild winters and gas furnace reliability for cold snaps. The dual-fuel option also qualifies for the heat pump rebate tier.
When is the best time to replace HVAC in Plano?
Spring (March through May) and fall (October through November) are the best windows for scheduling non-emergency HVAC replacements in Plano. Summer (June through August) brings a wave of emergency service calls that stretches contractors thin and reduces your ability to get detailed attention or negotiate price. Shoulder-season replacements typically come with faster scheduling and better contractor availability. If your system is aging but still running, plan your replacement proactively rather than waiting for a July failure during a heat wave.