Harrisburg / St. Marys
St. Marys has 12,529 residents (give or take 18) (ACS 2020-2024 5-year, table B01003, https://data.census.gov/table/ACSDT5Y2024.B01003?g=160XX00US4267344, checked 2026-10-19), about 126 people per square mile.
St. Marys is about 118 miles from the Census center point for Harrisburg in a straight line and covers 99.316 square miles of land (Census 2024 Gazetteer internal points and land area, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/, checked 2026-10-19).
The quote form takes a ZIP code; for St. Marys that is 15857 (Census 2020 ZCTA to county subdivision and ZCTA to place relationship files, ZIP areas at least 20% inside the town, https://www2.census.gov/geo/docs/maps-data/data/rel2020/zcta520/tab20_zcta520_cousub20_natl.txt and https://www2.census.gov/geo/docs/maps-data/data/rel2020/zcta520/tab20_zcta520_place20_natl.txt, checked 2026-10-19).
St. Marys is spread out at 126 people per square mile across 99.316 square miles of land, so a long refrigerant line run between the outdoor unit and the farthest indoor head is the sizing question an installer checks first.
Of the 5,692 occupied homes in St. Marys, 78% heat with natural gas, 1% with heating oil, 16% with electricity and 1% with propane (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US4267344, checked 2026-10-19).
Gas heats 78% of St. Marys against electricity at 16%, so most quotes here are a partial-home system that carries the shoulder seasons and the summer while the gas furnace handles the coldest nights, or a whole-home system when the house is ready for it.
St. Marys has 3 points less oil heat than Elk County as a whole, where 4% of homes burn oil, and 2 points more electric heat than the county's 14% (ACS 2020-2024 5-year, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=050XX00US42047, checked 2026-10-19).
St. Marys has 6,300 housing units, 21% built before 1940 and 74% before 1980, with 6% built in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US4267344, checked 2026-10-19).
St. Marys has 3 points fewer pre-1940 homes than Elk County as a whole (24%) (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=050XX00US42047, checked 2026-10-19).
The median St. Marys home was built in 1961 (ACS 2020-2024 5-year, table B25035, https://data.census.gov/table/ACSDT5Y2024.B25035?g=160XX00US4267344, checked 2026-10-19) and the median home has 6.1 rooms (ACS 2020-2024 5-year, table B25018, https://data.census.gov/table/ACSDT5Y2024.B25018?g=160XX00US4267344, checked 2026-10-19).
82% of St. Marys homes are single-family detached, 7% are in two- to four-unit buildings and 7% are in buildings of five or more units (ACS 2020-2024 5-year, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US4267344, checked 2026-10-19).
With 82% detached houses and 7% in small multi-family buildings, a St. Marys quote is usually one or two outdoor units with ducted or ductless heads sized room by room. With 22% of St. Marys homes rented (ACS 2020-2024 5-year, table B25003, https://data.census.gov/table/ACSDT5Y2024.B25003?g=160XX00US4267344, checked 2026-10-19), the landlord signs the quote in many of them.
74% of St. Marys homes were built before 1980 and only 6% in 2000 or later (ACS 2020-2024 5-year, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US4267344, checked 2026-10-19), so most of the stock predates modern insulation codes; the installer's heat-loss calculation, not a square-footage rule, decides the tonnage.
No electric utility is on file for St. Marys on this door yet, so this page does not name one; the name on the bill decides which rebate path applies.
Median household income in St. Marys is $67,167 (ACS 2020-2024 5-year, table B19013, https://data.census.gov/table/ACSDT5Y2024.B19013?g=160XX00US4267344, checked 2026-10-19); many state and utility heat pump rebate programs set higher incentive tiers for income-qualifying households, so the household income on the application, not the town median, decides which level applies.
Heating design temperature: 2F. Source: ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), Elk County row, 99% heating, PDF pages 102 to 105 of 141 (Revised 11/11/2020), https://www.energystar.gov/sites/default/files/Design%20Temperature%20Limit%20Reference%20Guide%20(2019%20Ed)%20-%20ENERGY%20STAR%20Single-Family%20New%20Homes_Rev11.pdf, fetched 2026-10-19, 99%.
That 2F figure is the Elk County cold-day number a St. Marys heat pump is sized against, so ask the installer to show the system's heating output at 2F, not at the milder rating-label temperature.
Ask whether the quote is whole-home or partial-home, because with 78% of St. Marys on gas and 16% already electric the two paths carry different rebate figures and different sizing.
Ask for the heat-loss calculation room by room; the median St. Marys home has 6.1 rooms and was built around 1961, and the count of heads and the tonnage follow the rooms and the insulation, not the square footage.
The form on this page is the follow-up for St. Marys. The public number is the number the contractor quotes from.
No local contractor is named on this door for St. Marys yet. A request from this page goes to the first licensed shop that takes the door.