Autonomy scoreLocal analysis
San Antonio Home autonomy potential in San Antonio (78205)
The strongest asset here is Low-carbon heating. It is not, however, what pays your home the most: that is Food growing.
Annual potential, standard home
$2,064
Four items added up — each one is a separate decision, in whatever order suits you.
Overall score
57 /100
Growing
San Antonio: 57/100 achievable autonomy with a recommended setup.
Solid potential — real, achievable gains in energy, water & food autonomy await.
What you could reach in San Antonio
A typical home in San Antonio can reach about 57% self-sufficiency with a right-sized solar, storage, rainwater and low-carbon heating setup — most of it backed by federal tax credits. The figure sharpens once you enter your own home.
- ≈172 days a year off the grid — keep the fridge, lights, router and heating pump running straight from your own roof and battery, right through a winter outage.
- Rainwater self-reliance — ≈66,130 L harvested from a 100 m² roof covers the garden and toilet flushing, so hosepipe bans stop mattering.
- A real harvest — ≈320 kg of fresh vegetables over a ≈322-day frost-free season takes a genuine bite out of the weekly shop.
- A warm, low-bill winter — insulation plus a right-sized heat pump turns the local climate into low-carbon comfort and shields you from gas-price spikes.
From the most to the least profitable, here
What you could gain
-
Food growing70/100
~$896/yr
off the weekly shop — up to ≈320 kg/yr of fresh vegetables from 100 m²
The detail
Realistic outlook
With about 322 frost-free days, a household garden in San Antonio supports up to three planting rotations a year.
Watch-outs
A productive garden needs space, decent soil and a few hours a week — start small and scale up.
Incentives & tips
USDA People's Garden and many municipal community-garden and composting programs support home food production.
Frost-free growing season : ≈ 322 days — Source: PVGIS, hourly ERA5 temperatures 2005–2015 (frost dates).
-
Solar energy39/100
~$597/yr
less electricity with 3 kWp on your roof (≈4,593 kWh/yr)
The detail
Realistic outlook
At 1,531 kWh/kWp per year, San Antonio offers moderate potential for residential rooftop solar.
Watch-outs
Roof orientation, shading and local interconnection rules affect real output — get a site assessment first.
Incentives & tips
Federal Residential Clean Energy Credit (IRA §25D): 30% tax credit on solar PV and battery storage through 2032.
Annual PV yield : 1,531 kWh/kWp — Source: PVGIS 5.2 (EU Joint Research Centre), optimal tilt and local horizon.
-
Low-carbon heating90/100
~$371/yr
less heating after insulation + heat pump (−2,250 kWh/yr on 90 m², electric heating)
The detail
Realistic outlook
700 heating-degree-days: a high-efficiency heat pump is the lowest-carbon way to keep San Antonio warm.
Watch-outs
A heat pump only pays off in a well-insulated envelope — insulate first, then size the unit.
Incentives & tips
Energy Efficient Home Improvement Credit (§25C): up to $2,000/yr for heat pumps plus credits for insulation; HEEHRA state rebates may stack.
Heating-degree-days (base 18°C) : ≈ 700 HDD — Source: PVGIS, hourly ERA5 temperatures 2005–2015 (base 18°C).
-
Rainwater54/100
~$200/yr
less mains water with a 5,000 L tank (≈66,130 L/yr harvestable from a 100 m² roof)
The detail
Realistic outlook
778 mm of rain a year makes rooftop rainwater harvesting worthwhile in San Antonio.
Watch-outs
Harvested rain is non-potable by default — keep it separate from drinking water and add a first-flush diverter.
Incentives & tips
Rainwater incentives vary by state — e.g. Texas sales-tax exemption on harvesting equipment, local rebates in Arizona. Check state and city programs.
Average annual rainfall : 778 mm — Source: NASA POWER, MERRA-2 corrected precipitation.
$2,064
Ranked by annual value. The order of the works themselves does not change: insulate before you equip.
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Estimate your solar system in San Antonio
Estimate your solar system in San Antonio
Based on a local yield of 1,531 kWh/kWp per year.
Indicative estimate (production = kWp × local yield). Real output depends on roof orientation, shading and your self-consumption rate.
What is specific to San Antonio
San Antonio's Office of Historic Preservation says the earliest houses in Lavaca, King William and Dignowity Hill, built before the railroad, were mostly vernacular caliche-block homes reflecting German and Hispanic traditions. Once rail and streetcars opened up new suburbs, the bungalow became the predominant house; the mid-century ranch followed, with low-sloped roofs and deep eaves. Exterior work in any of the city's 32 local historic districts, including the roughly seven-mile Mission district on the South Side, must follow the Historic Design Guidelines.
A sustainability guide the Historic and Design Review Commission approved in September 2022 covers energy upgrades. Solar does not need OHP approval, but the guide asks for panels on side or rear roof slopes, mounted flush and, on a front slope, at least 18 inches back from the eaves. It recommends attic insulation and interior storm windows and advises against wall insulation, citing trapped moisture and rotting framing. Staff can approve white asphalt shingles and roll-on white coatings for metal roofs.
CPS Energy, the city-owned utility, currently offers no residential solar rebates and points homeowners to free Bring Solar Home advice from Build San Antonio Green. Its Sustainable Tomorrow Energy Plan, authorized in June 2022, pays $90 to $310 per cooling ton for qualifying heat pumps and mini-splits, $0.35 per square foot for contractor-installed attic insulation and up to $0.20 per square foot for a rated cool roof. My Battery Rewards gives battery owners a $10 bill credit per grid event, and in 2026 CPS is adding up to 50 megawatts to Big Sun Community Solar, open to all customers, renters included. The city's Under 1 Roof program offers 0% interest forgivable loans of up to $19,000 for cool roofs, with eligibility based on mapped urban heat islands and an income cap of 80% of area median income.
Low Edwards Aquifer levels put San Antonio Water System customers back under Stage 3 watering rules in September 2026, and they still applied in October. Sprinklers and irrigation systems may run only once a week, on a day set by the last digit of your address, and single-family accounts pay a surcharge on use above 20,000 gallons a month. Beds used only for vegetables the household eats may be drip-irrigated Monday, Wednesday and Friday during watering hours.
SAWS pays $1 per gallon, up to $2,000, for cisterns of at least 500 gallons, but only on lots with no irrigation system or potable backup, and only after a large-cistern workshop at Alamo Community Colleges' Eco-Centro; city code also requires registering the cistern. Applications for WaterSaver Landscape Coupons, for replacing at least 200 square feet of lawn, reopen March 1, 2027. Green Spaces Alliance of South Texas supports a network of community gardens, and in 2023 it and Love, Tito's Block to Block began a three-year effort to make four of them, including Garcia Street Urban Farm, hub gardens.
Sources
- City of San Antonio OHP – A Guide to San Antonio's Historic Resources (Historic Design Guidelines)
- City of San Antonio OHP – Historic Districts
- City of San Antonio OHP – Design Guidelines & Policy
- City of San Antonio OHP – Sustainability and Energy Retrofit Policy Guide (September 2022)
- CPS Energy – About Us
- CPS Energy – Residential Rooftop Solar
- CPS Energy – Sustainable Tomorrow Energy Plan (STEP)
- CPS Energy – HVAC Rebates Specifications
- CPS Energy – Home Energy Rebates Specifications (attic insulation, cool roofs)
- CPS Energy – My Battery Rewards
- CPS Energy – Community Solar (Big Sun)
- City of San Antonio NHSD – Under 1 Roof: Cool Roofs for High-Heat Areas
- SAWS – SAWS customers return to Stage 3 watering rules (Sep 21, 2026)
- SAWS – Stage 3 drought restrictions
- SAWS – Homepage (Stage 3 Rules in Effect, October 2026)
- SAWS – Vegetable Gardens watering exception
- Garden Style San Antonio (SAWS) – Rain Garden and Cistern Rebate
- Garden Style San Antonio (SAWS) – WaterSaver Landscape Coupon
- Green Spaces Alliance of South Texas
- Community Impact – Partnership sets out to transform 4 San Antonio community gardens (Apr 18, 2023)
Facts checked on October 21, 2026.
Climate month by month in San Antonio
In San Antonio, a 3 kWp array pitched at 28° and facing 8° west of south — the optimum PVGIS computes for this location — produces about 4,593 kWh a year. August is the strongest month, at about 447 kWh, and December the weakest, at 303 kWh. November to February still bring 28% of the year's output, so the system stays useful all winter and a battery pays its way year-round.
The heating season runs from December to February: 3 months average below 59 °F (15 °C), and January is the coldest at 53 °F (11.4 °C). In a typical year the coldest hours drop to about 36 °F (2 °C), the point a heat pump has to be sized for: mild conditions, the easiest case for any heat pump.
Frost is possible until mid-February and returns from early December, which leaves about 322 frost-free days; tender crops such as tomatoes, beans and squash go outside once mid-February is past. Expect about 144 days above 86 °F (30 °C): shade netting and mulch matter as much as frost protection, and the water tank is drawn hardest in August.
With a mean wind of 7 mph (3.2 m/s) at 10 m, a small rooftop turbine would produce little in San Antonio; the roof is better used for solar. The southern horizon is open (at most 0.4°) in PVGIS's elevation model, so low winter sun reaches roofs unless nearby buildings block it.
Compared with Austin, 74 miles away, San Antonio has 1% more solar yield, 19 more frost-free days and a heating need 16% lower. Compared with Houston, 189 miles away, San Antonio has 5% more solar yield, 4 more frost-free days and a heating need 4% higher.
| Month | Mean temperature | Solar output, 3 kWp |
|---|---|---|
| January | 53 °F (11.4 °C) | 330 kWh |
| February | 56 °F (13.2 °C) | 324 kWh |
| March | 63 °F (17.2 °C) | 396 kWh |
| April | 70 °F (21.3 °C) | 393 kWh |
| May | 76 °F (24.6 °C) | 408 kWh |
| June | 83 °F (28.2 °C) | 423 kWh |
| July | 84 °F (28.8 °C) | 429 kWh |
| August | 86 °F (30.1 °C) | 447 kWh |
| September | 81 °F (27.0 °C) | 384 kWh |
| October | 72 °F (22.3 °C) | 414 kWh |
| November | 62 °F (16.7 °C) | 339 kWh |
| December | 54 °F (12.4 °C) | 303 kWh |
Frequently asked questions — San Antonio
How much could solar panels generate in San Antonio?
A well-oriented 3 kWp rooftop array in San Antonio produces about 4,593 kWh a year, worth roughly $597 in self-consumption. A 6 kWp system reaches about 9,186 kWh/yr where the roof allows. Federal Residential Clean Energy Credit (IRA §25D): 30% tax credit on solar PV and battery storage through 2032.
Is rainwater harvesting worth it in San Antonio?
Yes. A 60 m² roof in San Antonio can capture about 39,678 litres a year for the garden, WC and washing machine. Keep harvested rain separate from drinking water and fit a first-flush diverter. Rainwater incentives vary by state — e.g. Texas sales-tax exemption on harvesting equipment, local rebates in Arizona. Check state and city programs.
What grants help with low-carbon heating in San Antonio?
Energy Efficient Home Improvement Credit (§25C): up to $2,000/yr for heat pumps plus credits for insulation; HEEHRA state rebates may stack. Insulate first — a heat pump only pays off in a well-insulated home (700 heating-degree-days here), so prioritise the roof and walls before sizing the unit.
How much food can a garden grow in San Antonio?
With about 322 frost-free days, a 100 m² garden in San Antonio yields roughly 320 kg of fresh fruit and vegetables a year — a partial share of a household's needs, not full calorie autonomy. USDA People's Garden and many municipal community-garden and composting programs support home food production.
When is the last frost in San Antonio?
Frost is possible until mid-February and returns from early December, which leaves about 322 frost-free days; tender crops such as tomatoes, beans and squash go outside once mid-February is past.
How much does solar produce in winter in San Antonio?
December is the weakest month: a 3 kWp array makes about 303 kWh, against 447 kWh in August. November to February add up to 28% of the yearly total.
How this score is calculated
Public climate data (PVGIS with NREL's NSRDB radiation) weighted by how vital each dimension is. The score sharpens once you enter your own home. See the full methodology.
Sources
- Solar energy — Source: PVGIS 5.2 (EU Joint Research Centre), optimal tilt and local horizon.
- Rainwater — Source: NASA POWER, MERRA-2 corrected precipitation.
- Food growing — Source: PVGIS, hourly ERA5 temperatures 2005–2015 (frost dates).
- Low-carbon heating — Source: PVGIS, hourly ERA5 temperatures 2005–2015 (base 18°C).
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