A Marysville homeowner called after their furnace kept turning on and off and never seemed to get the house up to a comfortable temperature. With wet, chilly mornings common in our part of Washington, the issue felt urgent because reliable heat matters from October through April.
1. What the homeowner was experiencing before the call
- Furnace short cycled, running just a few minutes at a time
- Home struggled to maintain the thermostat setpoint
- Noticeable drop in comfort during cooler, damp mornings
- Unit was a 14 year old natural gas furnace
Short cycling like this often means the system is overheating or sensing a problem and shutting down to protect itself. For a homeowner in Snohomish County, that behavior is a concern because repeated short cycles wear parts faster and leave the house cold when it matters most.
2. What our inspection revealed on this 14-year-old unit
- Cracked heat exchanger confirmed during visual inspection
- Evidence of soot and uneven combustion patterns
- System control sensed unsafe conditions and triggered repeated shutdowns
- Age of the furnace made a full repair less certain as a long-term fix
A cracked heat exchanger is a serious safety issue on a gas furnace because it can allow combustion gases to mix with the home air. Given the unit’s age, repairing the exchanger may only be a temporary measure, so we discussed the balance between immediate safety and long-term reliability with the homeowner.
3. The steps we took to protect this home
- Placed the furnace into a safe, non-operational condition to prevent combustion while we continued assessment
- Performed containment and ventilation checks to ensure indoor air quality was not currently being compromised
- Documented findings and photographed the heat exchanger for the homeowner’s records
- Scheduled a follow-up visit for a full assessment and to review repair versus replacement options
Professional service in this situation is about more than fixing a broken part. It starts with protecting the household from unsafe operation, then giving clear, local-focused guidance on the best path forward. We handled the safety steps immediately and left the homeowner with options and a scheduled follow-up to make a confident decision.
Stay Warm with Altitude Heating and Cooling
If your furnace is short cycling or not keeping your home warm, call the trusted local pros at Altitude Heating and Cooling. We serve homeowners across Snohomish and King County and will make safety our first priority. Reach us at (425) 201-1998 or altitudeheating.com.
