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Why Isn’t My Furnace Heating My House? Common Issues in Fresno Homes
The first cold night of the season hits Fresno, and your furnace kicks on—but the house still feels chilly. If your heater is running but your toes are frozen, you’re not alone. Many Fresno and Clovis homeowners experience heating issues right when they need their system the most.
Here’s the good news: not all furnace problems mean major repairs. Some issues are quick fixes, and others can be caught early with a little know-how. At Nalk AC and Heating, we’ve seen it all—and we’re here to help you get warm without wasting time or money.
1
Thermostat Issues
Let’s start simple. If your furnace is blowing cold air or not turning on at all, double-check your thermostat:
Ask: Is it set to “heat” and not just “auto” or “fan”? Has someone in the house changed the schedule or settings? Are the batteries dead?
These small things can make a big difference. If the thermostat isn’t communicating properly with the furnace, nothing works like it should.
Learn more about Heating Repair>>
2
Clogged Filters
One of the most common (and easily overlooked) issues is a dirty air filter. When your filter is full of dust, your system has to work harder to push air through—and that can lead to poor airflow, cold spots, or even a system shutdown.
Changing your filter every 1–3 months is one of the easiest ways to avoid heating problems and lower your energy bill.
Book Heating Maintenance >>
3
Ignition or Pilot Problems
Modern gas furnaces use electronic igniters. Older ones have standing pilot lights. If either system fails, the furnace won’t produce heat. You might hear the system running, but it’s not actually warming the air.
This can happen due to: A dirty sensor, faulty igniter, pilot light going out in wind or due to buildup.
These issues are best handled by a licensed technician. It’s fast, safe, and usually a lot cheaper than waiting until something bigger breaks.
4
Ductwork Leaks or Blockages
Even if your furnace is producing warm air, it might not be reaching every room. That’s often due to leaky ducts or blockages in your ventilation system.
If certain rooms are colder than others or your system seems to run constantly, it could be time to check the ductwork. Older homes in Fresno and Clovis are especially prone to these issues.
5
Lack of Maintenance
Like any hardworking machine, your furnace needs regular checkups. Small parts wear out, wires loosen, dust builds up. Over time, these small things become big problems.
A professional furnace tune-up from Nalk AC and Heating can:
• Catch problems early
• Improve heating performance
• Extend the life of your system
• Help you avoid surprise breakdowns on cold nights
Read: Do I Need to Replace My Heater?
When to Call Nalk
If you’ve tried the basics and your home still isn’t warming up, don’t wait for it to get worse. We help Fresno and Clovis homeowners every day get their heat back fast—with honest service, upfront pricing, and real results.
Give us a call at (559) 277-8448 or book online.
We’re your neighbors. And we’re here to keep your home comfortable.
Real Reviews from
Real Central Valley Customers
We believe great work speaks for itself. Here’s what real customers are saying about Nalk AC and Heating:
“Ruben identified the problem quickly and repaired the issue promptly. He then explained the problem and the repair. He was prompt, courteous and knowledgeable.”
Pete Flores
Google Review
“Ruben was great and gave us helpful information and tips about our heating system. Highly recommend!”
Eros Jiménez
Google Review
“Juan was courteous and helpful. He performed the maintenance service in a professional manner.”
Ken Garcia
Google Review
“Arrived on time and was very efficient. Explained findings and changed out the filter. Very happy with the service call.”
Janette Leach
Google Review
“They contacted me to make an appointment to service both of my 5-ton heat pumps they installed last year… replaced the filters, everything was serviced. As always, NALK went over and beyond.”
Steven Lightle
Google Review
"Nalk installed a new complete AC system for our church. Great assessment, great communication, and finished on time."
Nathan M.
Google Review
What to Expect When You Call Nalk
We start by sending a technician to your home for a full system assessment. We look at your current equipment, your comfort goals, and your home’s layout to make the best recommendation. Sometimes, that visit reveals something small we can fix right away to make your existing system run better. It’s all part of our fix-it-first philosophy — we’ll never push a replacement unless it makes real sense.
There is a charge for this visit, but we keep it affordable because we don’t want cost to be a barrier to smarter energy use and better comfort.
If a heat pump is the right fit, we’ll walk you through your options and schedule the install at a time that works for you.
Whether you're in Fresno, Clovis, Madera, or anywhere in the Central Valley, Nalk is ready to help you save on energy and boost your home's comfort.
Nalk Air Conditioning and Heating
OFFICE ADDRESS:
4535 N Bendal Ave #105
Fresno, CA 93722
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