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Furnace Blowing Cold Air in Collierville, TN Homes
Vents blowing cold in Collierville: one call to us reaches a local HVAC company.
A furnace blowing cold air in Collierville, TN, points to burners that are off while the blower keeps running. The manufacturer's main limit control shuts the burners and runs the blower when the furnace overheats. We put a local heating and cooling company on the line to check the filter, test the limit switch, and measure the temperature rise.
Who Calls About This
You call about a furnace blowing cold air as the owner of the system, a condo or townhome owner, or a landlord.
- Homeowners
- December through February carries 2,069.5 heating degree days at the NOAA Collierville station, against 2,874.9 for a whole year at Memphis International. Cold vents in those months leave your home short of heat.
- Condo and Townhome Owners
- Your unit's furnace is yours to repair under Tennessee condo law, while the association handles common elements unless the declaration assigns them otherwise.
- Landlords
- Tennessee's landlord and tenant act requires fit and habitable premises in Shelby County rentals, and it covers counties over 75,000 people. Fayette County counted 38,413, so for Piperton and Rossville rentals we tell landlords to check the lease for heat terms. Renters with cold vents check with the landlord before calling.
Inside a Standard Furnace Repair
Cold-air calls fall under repairs on a gas furnace. These 7 checks follow the manufacturer's terms:
Inspects the filter, which the manual says to check each month and never to run without.
Measures the temperature rise and compares it with the range on the furnace nameplate.
Tests the main limit switch, which stops the burners and runs the blower on overheating.
Checks the flame sensor and the hot surface ignitor in the ignition sequence.
Inspects the rollout switch, which cuts power to the gas valve when flame rolls out.
Measures static pressure across the ducts and the blower.
Confirms warm air at the registers with a start-up check and recorded readings.
Duct changes and a new thermostat fall outside the repair, so ask for each one as its own priced line before you approve work.
Say whether the vents start cold or turn cold mid-cycle, and ask which control the company plans to test first.
(901) 613-0388Local Furnace Issues and What Your HVAC Company Does
These 4 cold-air situations in Collierville homes each lead to a specific part.
| What you notice | What your HVAC company does |
|---|---|
| Warm air comes out at first, then turns cold while the blower keeps going. | Per the manufacturer's manual, an overheated furnace trips the main limit, which stops combustion and leaves the blower on. The filter and airflow behind the trip get checked, and repeated trips show up as furnace short cycling. |
| Air stays cold from the start, and the burners never light. | The 2 ignition parts explained under furnace ignitor and pilot problems get tested first. |
| The filter is dirty, torn, or missing. | The manual calls for a monthly filter check, a new filter when torn, and no operation without one. The HVAC company fits the size the furnace takes and measures airflow afterward. |
| Neither the blower nor the burners respond to the thermostat. | That pattern matches a furnace not turning on, where testing starts with the pressure switch and gas valve. |
Steps From the First Call
A cold-air call follows 4 steps, and your phone call comes first.
- 1
Call with what the vents do
You describe whether the air runs cold from the start or turns cold partway through the cycle. That detail separates a limit trip from an ignition fault, so give it to the local company we get on the line.
- 2
Check the filter
You look at the filter, the owner task the manufacturer's manual allows, and note the size printed on its frame.
- 3
Host the diagnostic visit
The HVAC company measures the temperature rise and tests the limit and ignition controls, then explains the repair it recommends. Ask for a written estimate before work starts.
- 4
Approve the repair
Once you approve, the company swaps the failed part and runs the furnace until warm air returns at the registers.
What Decides the Price When a Furnace Is Blowing Cold Air
No public source lists a Collierville price for a furnace blowing cold air, so 4 factors set the bill:
Factor 1
The Part Behind the Cold Air
A limit switch, a flame sensor, and a hot surface ignitor each carry their own part cost and labor.
Factor 2
Airflow Fixes
Airflow work runs from a new filter to duct changes, and the static pressure reading sets its price.
Factor 3
Furnace Efficiency Class
A 90%-plus AFUE furnace adds a condensate trap and PVC venting, unlike an 80% AFUE unit with metal venting, per the manuals.
Factor 4
Warranty Registration
Keep the furnace's warranty card or registration handy, since the FTC tells buyers to ask whether they pay for labor.
Ask what part sits behind the cold air and what temperature rise your furnace shows.
(901) 613-0388Codes and Permits That Apply in Collierville
Collierville exempts normal repairs from a building permit, so a limit switch swap goes ahead without one. The Town still requires a state or county licensed contractor for mechanical work. Questions go to the Building and Codes Division at 500 Poplar View Parkway.
The Town enforces the 2018 International Mechanical Code and International Fuel Gas Code until January 1, 2027. New permits from that date follow the 2024 codes, and we flag that date for any repair that turns into a change-out.
Coverage and Rebate Questions
Triple-I says homeowners insurance does not cover damage due to lack of maintenance. Coverage and warranty answers continue in the furnace and AC questions. Ask the company to note the filter's condition in its findings for your records.
Why Does the Blower Run While the Burners Stay Off?
The blower runs with the burners off when the main limit control trips, since the manufacturer's manual says it stops combustion on overheating. The same manual's sequence relies on the flame sensor to prove burner flame, so that part gets tested too. The filter is the one part the manual has owners check, so we recommend mentioning its condition and asking which control kept the burners off.
Collierville Details That Change the Repair
- December, January, and February each top 600 heating degree days at the NOAA Collierville station. We suggest timing your monthly filter checks around those 3 months.
- The manufacturer's manual asks for a yearly inspection by a qualified service person, the visit described under furnace maintenance.
- Gas heats 61.3% of occupied homes in ZIP 38017, and 11.0% of Collierville homes date from 1979 or earlier, per the Census Bureau. Mention any duct changes when you call.
Before you dial
Questions Before You Call
Open any question below for its answer
Is a Furnace Blowing Cold Air Safe to Run?
No, not before testing, because the manual's main limit trips on overheating and that trip leaves the blower pushing unheated air. The manual also forbids bypassing that limit. Ask to hear the cause named before the furnace runs again.
How Much Does It Cost to Fix a Furnace Blowing Cold Air?
No public source sets a Collierville price. The cost turns on the part behind the cold air, the airflow fix, the furnace's AFUE class, and warranty labor. Ask which part the company suspects and what the repair includes.
What Filter Schedule Does the Furnace Manufacturer Set?
The manufacturer's manual says to check and clean the filter each month, or more frequently when required, and to replace a torn one. It also bars running the furnace without a filter. Have the company confirm the filter size your furnace takes.
Where Is the Furnace's Temperature Rise Range Listed?
The temperature rise range sits on the furnace nameplate, per the manufacturer's manual, and the measured rise belongs within those limits. The HVAC company measures supply and return air to find the rise. Ask what reading it got and how it compares with the nameplate.
Does Fixing a Furnace That Blows Cold Air Need a Collierville Permit?
No, the Town of Collierville exempts normal maintenance and repairs from a building permit, while a full furnace change-out needs one. Ask whether the recommended work stays a repair or becomes a change-out.
Other Services to Consider
- Furnace Safety Inspection
Flue, vent, combustion air, and safety control checks show whether a furnace is fit to keep running.
- Furnace Making Noise
Furnace sounds sorted by the stage they start in, and the part a local HVAC company tests for each one.
- Furnace Smells
Gas smell steps from the local gas utilities, plus what a local HVAC company inspects for dust or burning odors.
This page relies on 17 public documents, such as records from Carrier, Insurance Information Institute, and FTC. Find each one and its check date in the records behind each page list.
Morton Furnace Repair
Reach a Heating Company That Serves Collierville
Describe what your furnace is doing, and we put a local heating and cooling company on the line with you.
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