Heating and Furnace Service | Oakland & Macomb County

The short answer

Start with the complete system and the evidence

Heating service follows the furnace's operating sequence and checks how heat reaches the rooms. Sandison evaluates controls, fuel, power, venting, and airflow to identify the repair needed and any distribution problem affecting comfort.

What Sandison evaluates

A practical path from symptoms to the right scope

Clear diagnostic process
Licensed multi-trade coordination
Repair and replacement options
Residential and commercial support

No-heat and comfort diagnosis

A furnace problem can begin with fuel, air, venting, controls, power, or the distribution system

Sandison evaluates the operating sequence instead of treating every no-heat call as a failed furnace part. The review can include thermostat demand, electrical supply, safeties, ignition, gas delivery, combustion-air and vent conditions, temperature behavior, blower operation, filter restriction, return and supply airflow, duct condition, condensate management, and connected accessories. A system that starts may still have a restriction or safety concern; a system that does not start may be responding correctly to a condition elsewhere in the installation.

Repair and replacement planning

New heating equipment should not inherit an ignored airflow, venting, or control defect

When replacement is considered, Sandison looks beyond matching the old nameplate. Building load, equipment sizing, return-air capacity, supply distribution, venting, gas and electrical requirements, filtration, humidification, thermostat wiring, condensate routing, equipment access, and future service all affect the scope. Repair remains appropriate when the failure is understood and the remaining system supports it. Replacement recommendations identify the existing limitations that must be corrected so a new furnace is not commissioned into the same condition that shortened comfort or reliability before.

Primary references

Verify the local and credential information.

U.S. Department of Energy — home heating systems

Common questions

What property owners ask

Why does my furnace run while some rooms stay cold?

Restricted returns, supply ducts, zoning, building heat loss, and blower performance can limit delivery to particular rooms. Comparing room symptoms with equipment operation helps determine whether the correction belongs at the furnace or in the distribution system.

What does it mean when a furnace starts and then stops?

The point where the operating sequence stops matters: controls, ignition, safeties, airflow, and venting can produce similar symptoms. Record any visible fault code and when the shutdown occurs so the technician can investigate the sequence.

How do you decide whether a furnace is worth repairing?

The decision considers the confirmed failure, safety, parts availability, service history, and the remaining system's condition. Replacement planning also needs to address airflow, venting, and controls that could otherwise continue causing problems.

Evidence and review

Why this page can be trusted

Service information based on Sandison’s documented trade scope and the technical references below. Contact the office to discuss the conditions at your property.

Technical lead: James Sandison, B.S. Mechanical Engineering, Oakland University. Michigan Mechanical License 7115733 · Michigan Master Plumber 8112263 · Michigan Plumbing Contractor 800-3618. Service information record: 2026-08-28.