Primary heating system
Primary heating equipment type for the building (e.g., furnace, heat pump, boiler). Known or imputed for 41.7 million addresses — 35.2% of the addresses Faraday knows.
At a glance
- Coverage today
- 35.2%
- Typical coverage
- 35.0%
- Addresses with a value
- 41.7M
- Share in largest category
- 44.0%
- Most values come
- from the address
- Latest collection
- May 1, 2026
How the categories split
n = 41,699,645Share of addresses in each category. 13 categories, with 44.0% in the largest.
Category shares over time
Forced Air43.9% (largest)The 5 largest categories, each followed across 12 collections. Estimated from a 1% sample of addresses.
Coverage
Latest collection: 119,982,292 addressesCoverage by state
Percentage of addresses in each state with a value.
Coverage over time
35.2% todayShare of addresses holding a value at each monthly snapshot. A value carries forward for one year.
How we arrive at a value
Whether a value was observed on the person themselves, carried from their address, or estimated from the people around them.
- On the person — 0%
- Not used for this attribute — no value is inherited this way.
- From address — 100%
- Carried from what we know about the household at their address.
- From geography — 0%
- Not used for this attribute — no value is inherited this way.
Coverage, in context
Where 35.2% sits on the catalog’s own coverage range.
Higher coverage than 50% of address-level attributes in the catalog
Freshness
How recently this was collected, and how often a new collection arrives. Each bar is the number of addresses in that collection. Gaps are real — collection is periodic, not continuous.
Change between collections
The share of addresses whose category changed.
of addresses changed value between the two most recent collections — 837.3× steadier than the catalog median of 13.5%.
Contribution ledger
13 ingestions
1 authority contributed since Jul 2023.
| Observed | Ingested | Count | ID |
|---|---|---|---|
| 2026-05-01 | 2026-09-10 | 266,506,942 | c5492806… |
| 2026-03-01 | 2026-07-01 | 264,096,977 | 1181277b… |
| 2026-02-01 | 2026-07-02 | 264,777,400 | af53c569… |
| 2025-12-01 | 2026-08-11 | 268,508,091 | 84d6a1c5… |
| 2025-11-01 | 2026-08-11 | 268,299,874 | a071c538… |
Technical details
- API name
- primary_heating_system
- Category
- fig/property
- Type · unit
- Text
- Statistical type
- nominal
- Allowed values
- null
- Derivations
- Observed
- — the attribute is directly observed.
- Directionality
- null
- Deprecation
- false
In a payload
{
"attributes": {
"primary_heating_system": "Forced Air"
}
}