Troy particulars
Troy enforces load calculations on new construction. For projects starting January 12, 2026, the city says new and addition residential work needs a performance-based compliance report and the Manual J, Manual S and Manual D design submittals. For replacement-only furnace or AC jobs, its page says alterations to a mechanical system must conform to the requirements for a new mechanical system. For heat we use the Detroit Metro airport normals because that is the nearest station we read, about 6,067 heating degree days a year (base 65 F).
DTE Electric and Consumers Energy are the electric and gas utilities whose territory covers Troy, so a gas furnace replacement points to Consumers Energy's 2026 chart (installs January 1 to December 31, 2026, amounts can change without notice). Troy publishes no city rebate that we read. The Building Department, 500 W. Big Beaver Rd, 248-524-3344, takes mechanical and other trade permits through BS&A Online, and permits needing plan review go in as PDFs by email.
Inspection requests run through BS&A or 248-689-5744, with a 2 PM cutoff. The city's 2026-27 fee schedule lists a $75 minimum mechanical permit; our reading of that schedule is medium confidence, so confirm the fee. About 60.5 percent of homes predate 1980. Clawson and Royal Oak are near. Our furnace repair page covers common faults.
Emergency HVAC in Troy: what to know
Consumers Energy covers the whole city's gas, and its steps are to leave at once, avoid every electric device including phones until you are outside, and call 911 first, then 800-477-5050. A sounding carbon monoxide alarm means fresh air and 911, per the Consumer Product Safety Commission. Michigan's Bureau of Fire Services recommends an alarm on every floor of a home.
If the furnace has gone cold because service was shut off, the winter utility shutoff guide covers what we could document. Where equipment must be swapped quickly, the Building Department's inspection line is 248-689-5744 with a 2 PM cutoff for requests, and applications go through BS&A Online. Troy's schedule lists a $75 minimum permit fee at medium confidence, and the permit is needed because LARA excludes only minor parts.
Permits for emergency hvac in Troy
LARA's permit rule excepts replacement of minor parts, so an emergency part swap generally needs none.
What counts as an emergency
- You smell gas: leave, call 911 and your gas utility from outside.
- A carbon monoxide alarm sounds or several people feel flu-like without a fever.
- No heat but the house is not yet cold, with no smell and no alarm: check the thermostat and filter, then book a visit.
- A noisy furnace that still heats.
Checks while you wait
Try this first: if you smell gas, leave the front door open behind you and do not switch on a light on the way out.
- Set the thermostat to heat, above the room temperature, with fresh batteries if it takes them.
- Change or clean the filter; ENERGY STAR says monthly.
- Note any light pattern or code on the furnace and stop; do not remove panels or relight after any gas smell.
What emergency hvac costs
The estimate below is the Michigan-wide one, adjusted for Michigan wages and not for Troy in particular. The same table is on the emergency hvac page. How we estimate costs. Prices as of Oct 19, 2026.
| Item | Figure | What it is |
|---|---|---|
| Estimated range, not a quote | $120 to $285 per hour of labor, before any call-out fee | Built from one national published range, adjusted by the Michigan HVAC technician wage ratio (1.00). |
| Technician wage, Michigan mean | $31.01 an hour | Technician pay (BLS, May 2025), not a price. |
| Technician wage, Detroit-Warren-Dearborn mean | $32.06 an hour | Technician pay, not a price. |
| Technician wage, Grand Rapids-Kentwood mean | $30.86 an hour | Technician pay, not a price. |
| Furnace replacement permit, Grand Rapids | $21 plus a $52 application | If the repair becomes a replacement. Effective July 1, 2026. |
How we estimate costs: the figures here are estimates, not quotes, built from BLS wages, published city permit fees and federal energy-cost evidence. We are collecting the prices Michigan heating and cooling companies publish; we have not yet collected quotes from them, and we will say how many and from when once we do. Estimated range. Built from national published ranges (1 source), adjusted by Michigan's HVAC technician wage ratio to the US (1.00, BLS May 2025), plus the local permit fee where the city publishes one. Not a quote. We have too few Michigan company prices yet to show a range. Full method.
Questions about emergency hvac
What counts as an emergency HVAC repair?
Those go to 911 and your gas utility first. A furnace that has stopped in freezing weather is urgent but is a call to a heating company once you are sure there is no smell and no alarm.
What should I do if I smell gas near my furnace?
DTE and Consumers Energy both say 911 first. Do not look for the source or use switches, appliances or phones inside, and stay out until responders or the utility say it is safe.
Can I cancel a repair contract signed during an emergency?
Michigan law lets a buyer cancel a home solicitation sale until midnight of the third business day, but not when you request the work without delay because of an emergency and the conditions are met. It covers sales solicited at your home, which is our reading of the statute.