If you’re like most homeowners in St. Louis, you’ve probably stood near your furnace or AC unit at least once thinking: “That doesn’t seem right…”
Before assuming the worst — let’s break down what’s normal, and what’s not.
Subject 1: Odors
Is It Normal for My Furnace to Smell When I First Turn It On?
Yes — sometimes. If it’s the first time you’ve turned your heat on after a long St. Louis summer, you may notice a dusty or slightly burning smell. That’s usually dust burning off the heat exchanger.
OK, that’s all great…but when is it NOT normal?
- Strong metallic, or “electrical” smell
- Rotten egg odor
- Smells that last longer than a few hours
If any of this happens, call for service immediately.
Subject 2: AC Run Time
Is It Normal for My AC to Run VERY Frequently During a Heat Wave?
Yes — Especially during peak St. Louis humidity. When it’s 95° with Midwest humidity, your AC may run almost continuously to maintain temperature. That doesn’t always mean it’s broken.
When it is NOT normal:
- House temperature keeps rising
- Warm air coming from vents
- Ice forming on refrigerant lines
If any of this happens, call for service immediately.
Subject 3: Uneven temperatures throughout the house
Is It Normal for One Room to Be Hotter Than the Rest?
In many St. Louis homes — yes. Older brick homes, attic ductwork, and second-story bedrooms often struggle with airflow.
When it is NOT normal:
- No airflow at all
- Rooms are 10+ degrees different
- System constantly short cycling
These issues may indicate ductwork, zoning, or sizing issues. Call for a consultation to evaluate these issues!
Subject 4: Short Cycling
Is It Normal for My System to Turn On and Off Frequently?
This is called short cycling, and is RARELY a normal behavior.
Sometimes “normal”: Mild spring or fall weather
Definitely Not Normal:
- System runs fewer than 5 minutes
- Constant clicking sounds
- Spike in your Ameren utility bill
Short cycling can shorten equipment life significantly. If this is happening to you – call for service immediately.
Subject 5: Noises from Vents?
Is It Normal for My Vents to Make Noise?
Yes – A soft “whoosh” of air? Totally normal.
When it is NOT normal:
- Loud banging
- Whistling (static pressure issue)
- Metal popping repeatedly
Those can signal duct expansion, airflow restriction, or system imbalance. Call your contractor for an evaluation!
Subject 6: Utility Bills Going Up?
Is It Normal for My Utility Bills to Go Up in Winter or Summer?
Yes — seasonal increases are expected in Missouri, based on how hard the system is working.
When is this NOT normal:
- 20–40% spike with similar weather
- No change in thermostat settings
- System running much longer than usual
That’s usually an efficiency issue or aging equipment.
So – to summarize – Call for service if you notice:
- Burning smells that don’t go away
- Loud metal banging
- Warm air during cooling season
- No heat in freezing temps
- System shutting off completely
The Bottom Line
In St. Louis, our systems work hard. Between humid summers and freezing winters, your HVAC equipment cycles more frequently than those in milder climates.
Sometimes strange is normal.
Sometimes strange is expensive when ignored.
If you’re unsure, it’s always cheaper to ask early than replace later.
STILL Not Sure If It’s Normal?
If you live in the St. Louis area and something doesn’t feel right, call us to schedule a quick system check. A small issue caught early can prevent a major breakdown during the next heat wave or cold snap.
Call IFS Residential Today for your peace of mind!
636-680-2100
