Heating and air conditioning repair in Philadelphia
Our guide to heating and air conditioning repair covers how the job works. Below: the Philadelphia numbers a HVAC contractor looks at, with sources.
Homes in Philadelphia
The median home in Philadelphia dates from 1949, so about half the housing is that old or older. Of the 56 other cities in this network, 48 have newer housing by median year built. Older homes here often have ducts and venting that were sized for a different system.
Source: Census ACS
Source: Census ACS
In Philadelphia, owner-occupied homes make up about 52% of occupied housing. That is 351,905 of 679,428 households. Of the 56 other cities in this network, 36 have a lower share of owner-occupied homes. If you rent, your lease likely puts heating and cooling repairs on the owner.
Source: Census ACS
Source: Census ACS
Utility gas is the leading heating fuel in Philadelphia, covering about 70% of occupied homes. Other fuels: electricity 25%, fuel oil or kerosene 3%, bottled or tank gas 2%. The fuel decides which contractor skills matter: gas lines and venting, or heat pump and electrical work.
Source: Census ACS
Source: Census ACS
Heating and cooling load in Philadelphia
By the NOAA 1991-2020 normals, summers in Philadelphia add up to about 1,603 cooling degree days. Measured at the Phila Franklin Inst (PA) station. The cooling load here is higher than in 31 of the 56 other cities we cover. More cooling degree days means more run hours, which is where worn capacitors and dirty coils show up first.
Source: NOAA normals
Source: NOAA normals
NOAA's 30 year normals give Philadelphia roughly 4,212 heating degree days annually. Measured at the Phila Franklin Inst (PA) station. Of the 56 other cities in this network, 31 have a lower heating load. That is the number a contractor's load calculation starts from when sizing heat for a house here.
Source: NOAA normals
Source: NOAA normals
Expect around 62 days a year when Philadelphia drops to 32 F or below, going by NOAA normals. Of the 52 other cities in this network, 23 have a lower number of freezing days.
Source: NOAA normals
Source: NOAA normals
Near Philadelphia the high reaches 90 F or more on about 40 days in a normal year. Of the 54 other cities in this network, 23 have a lower number of 90 F days.
Source: NOAA normals
Source: NOAA normals
Seasons and risk in Philadelphia
The heat wave risk for Philadelphia County, PA is rated very high in FEMA's National Risk Index. The same heat wave rating applies in 7 of the 55 other cities in this network. Heat waves are when an older air conditioner is most likely to fail, so a pre-season check pays off.
Source: FEMA risk index
Source: FEMA risk index
On cold wave risk, FEMA's National Risk Index puts Philadelphia County, PA at very high. The same cold wave rating applies in 16 of the 53 other cities in this network. Cold snaps are the hardest test for a heat pump; ask about backup heat.
Source: FEMA risk index
Source: FEMA risk index
Sources, checked October 2026
Local offices and rules in Philadelphia
L&I's 2021 I-Code transition materials include a document titled Proposed Philadelphia Changes to the 2021 sub-codes (dated May 28, 2026) covering the building, residential, mechanical, plumbing, energy and administrative codes.
Source: www.phila.gov. Checked October 2026.
Source: www.phila.gov. Checked October 2026.
Through PGW EnergySense, residential customers can get capped rebates for a furnace, a boiler and a combi boiler, with additional rebates for insulation and air sealing.
Source: www.pgworks.com. Checked October 2026.
Source: www.pgworks.com. Checked October 2026.
Philadelphia Gas Works (PGW) is the city's natural gas utility.
Source: www.pgworks.com. Checked October 2026.
Source: www.pgworks.com. Checked October 2026.
If you smell gas, leave the house and call your gas utility from outside. Keep a working carbon monoxide alarm near the bedrooms, and do not open a furnace cabinet that is running.
Common jobs
