Most homeowners assume that scheduling a heat pump installation means handing the job to their HVAC company and waiting for it to finish. That’s mostly true. But a handful of decisions made before the installer arrives determine whether the system is sized correctly, whether it runs efficiently from day one, and whether you can collect the CPS Energy rebate that could put hundreds of dollars back in your pocket. Getting those details right takes about an hour of your time.
At Westerly Air, we walk every customer through this process before we schedule, because we’ve seen what happens when the prep work gets skipped. A system installed in a home with unchecked ductwork or an undersized electrical panel doesn’t perform the way it should, and no amount of quality equipment fixes a problem that existed before we arrived. Here’s what to do on your end to make sure installation day goes smoothly.
Why San Antonio Homes Have Specific Installation Needs
San Antonio sits in IECC climate zone 2A, a warm-humid designation that shapes how heat pump equipment should be selected and sized. The design cooling temperature here is approximately 95°F; the design heating temperature is approximately 33°F. In practice, that means this is a cooling-dominant climate. A heat pump installed in San Antonio needs to be sized primarily around its ability to handle summer cooling loads, not winter heating capacity.
The standard method for determining correct equipment size is a Manual J load calculation, which accounts for your home’s square footage, insulation levels, window area, orientation, and local climate data. A contractor who recommends a system size based only on what you’re replacing is skipping this step. An oversized unit short-cycles, running in short bursts that don’t adequately control humidity. An undersized unit runs constantly and still can’t keep up on a 95-degree afternoon. Air-source heat pumps are well-suited to San Antonio’s mild winters and eliminate the need for a separate furnace, but only if they’re sized to match what your home actually requires.
Check Your Electrical System Before Installation Day
Heat pumps require a dedicated 240-volt circuit, and not every home’s electrical panel can accommodate one without an upgrade. A 100-amp panel is significantly more likely to need work than a 200-amp panel, particularly if you’ve added an EV charger, an electric range, or other high-draw appliances in recent years. Your installer should assess panel capacity during the pre-installation visit. If an upgrade is needed, it has to happen before the installation date. Discovering on the day of the job that the panel can’t support the new equipment can push the timeline by weeks depending on electrician availability.
One more detail worth confirming before installation day: smart thermostat compatibility. Not every thermostat works with every heat pump model, and compatibility is much easier to confirm during planning than after the system is already running.
Inspect Insulation & Ductwork First
Heat pumps deliver air at lower temperatures over longer run cycles than gas furnaces, which means any inefficiency in your home’s envelope becomes more noticeable. Before installation, seal gaps at doors, windows, and any attic penetrations you can access. Duct leaks should also be addressed. Issues discovered after the heat pump is running often require a second service call and additional cost. Handling these items beforehand also improves the accuracy of the Manual J calculation, so the equipment gets sized correctly from the start.
Understand the CPS Energy STEP Rebate Before You Schedule
CPS Energy’s STEP program offers rebates ranging from $90 to $275 per ton for qualifying heat pump installations, structured across five efficiency tiers based on SEER2 rating. The top $275-per-ton tier applies to systems with a SEER2 rating of 20.0 or above. On a 5-ton system, the difference between the entry tier and the top tier is $925, which makes equipment selection a financial decision you should be part of before anything is ordered. Note that the Section 25C energy efficiency tax credit was eliminated in 2025 and isn’t available for 2026 installations, making the CPS Energy STEP rebate the primary financial incentive currently on the table.
The rebate application must be submitted within 30 days of installation completion. For work inside San Antonio city limits, CPS Energy requires a permit number before processing the rebate. That means you need to confirm your contractor will pull a permit before you sign anything. A permit also protects you because it means the work is inspected by the city, not just signed off by the contractor.
Prepare Your Home the Day Before & Day Of
Clear at least three feet of space around the planned outdoor unit location and around the indoor air handler area. Installers need room to move equipment, run refrigerant lines, and make electrical connections without working around furniture or storage.
Two more practical steps worth taking the day before:
- Cover nearby furniture and valuables. Drilling and ductwork produce dust that settles in unexpected places.
- Secure pets in a separate room. Open doors and unfamiliar equipment are stressful for animals and create safety risks for your installation crew.
Plan for heating and cooling to be unavailable for four to eight hours on a standard replacement day. If anyone in your household is particularly sensitive to temperature, arrange accordingly. Whether that means spending the day elsewhere or scheduling the job during a mild week on the calendar is up to you.
What to Ask Your HVAC Contractor Before Signing
Contractor vetting protects both your investment and your rebate eligibility. Before you agree to anything, get clear answers to these three questions.
TDLR License Verification
All HVAC installations in Texas must be performed by a contractor licensed through the Texas Department of Licensing and Regulation. Unlicensed work is illegal in Texas and automatically disqualifies you from the CPS Energy rebate. You can verify a contractor’s license status on the TDLR website before you sign.
Permit & AHRI Certificate
Ask whether the contractor will pull the required city permit and whether they’ll provide the AHRI certificate number for the matched system. The AHRI certificate confirms that the indoor and outdoor components are rated as a matched system, which CPS Energy requires on the rebate application. If a contractor hesitates on either point, that’s worth noting.
Manual J Before Equipment Recommendation
A contractor should perform a Manual J load calculation before recommending a system size, not after, and not based only on what’s already in your home. If you’re hearing a recommendation before anyone has looked at your insulation levels, window count, or square footage, ask why.
Installation Is a Partnership
The day the system goes in, most of the work is ours. But the steps before that day (the electrical check, the ductwork assessment, the equipment tier decision, the permit confirmation) belong to both of us. When homeowners and installers prepare together, the result is a system positioned to perform as designed from the first day of operation and a rebate application that avoids rejection on a technicality.
At Westerly Air, we handle permitting, guide equipment selection to meet SEER2 rebate thresholds, and manage the documentation so the CPS Energy application goes in correctly and on time. If you’re ready to start the process, give us a call at (210) 361-2722.