01/29/2025
A new home owner originally called to inform me his furnace wasn’t putting out the best heat in his new home.
I visited to preform routine maintenance in order to go through the furnace top to bottom, and get a better understanding of what adjustments could be done to improve the heating quality. During maintenance, I preformed a safety inspection of the heat exchanger and found multiple areas on this 20+ year old furnace that were heavily rusted, but not currently cracked.
Customer has a newborn baby on the way, and I informed him that if the heat was going to be ran for the remainder of the winter, there has to be multiple CO detectors installed around the home and no higher than 3 feet off the ground. This recommendation is the bare minimum but realistically, the furnace needs to be replaced before the following winter to prevent heat exchanger failure occurring while occupants are in the home as this can be an extremely dangerous scenario, especially considering there will be a newborn soon.
(Air conditoners are okay to run ragged until they fail as there are no major safety concerns, but gas furnaces should always be preemptively replaced before a complete failure when the heat exchanger is looking heavily degredated)
As far as the furnace itself not giving the greatest heat, it was for two reasons. 1. Older homes typically don’t have the best insulation which creates more cold spots. Adding insulation to the attic, and modernizing the windows can help with that. 2. Older homes were built with different ductwork standards in mind. The ductwork from years ago was a lot bigger due to the furnaces from that era being double to triple the size which had a lot higher of a blower speed output compared to many modern furnaces which are now efficiency driven and therefore don’t typically blow air as hard.
We made some adjustments to a few dampers that were present, went over some options for ductwork size reducing, but ultimately, customer decided he could put the money together to replace the furnace now, so we shifted gears into a new plan.
We decided to upsize the new furnace to compensate for the outdated ductwork since the customer liked the idea of getting a two stage furnace installed. (Single stage furnaces typically shouldn’t be upsized past square footage recommendations) This should give the extra airflow needed to reach the upstairs of the home better and will not compromise energy efficiency due to the two-stage setup.
The current furnace was a 80,000btu, and we upsized it to a 100,000 btu two-stage Goodman furnace. This furnace will run at an output of 70,000btu on low stage, and will be setup to switch to the 100,000 btu high stage after 20 minutes of run time if the thermostat isn’t yet satisfied (which only should occur on extremely cold days).
After my installers were finished, I returned on-site to do a proper start-up procedure, safety inspection, and fine-tune all nessessary adjustments should as stage timing, gas pressures, and blower speeds.
System is running and heating well, and the customers now have much better air flow throughout the entire home, whilst still remaining energy efficient.
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