What gets measured during a tune-up
Measurement is what separates a tune-up from a look-over. These are numbers, compared against the manufacturer's data plate and expected ranges.
| Measurement | What it tells us |
|---|---|
| Temperature rise (supply minus return) | Whether airflow and firing rate are matched; high rise signals restriction, low rise signals underfiring or excess airflow |
| Flame sensor microamps | How much margin is left before the furnace starts nuisance-locking out |
| Ignitor resistance | Whether the ignitor is degrading toward failure |
| Capacitor microfarads | Whether the blower's start/run capacitor is still within tolerance |
| Blower and inducer amp draw | Motor health and bearing condition |
| Static pressure across the system | Whether the duct system is overloading the blower |
What gets cleaned and adjusted
- Burners cleaned and flame pattern observed
- Flame sensor cleaned to bare metal and re-tested
- Blower compartment and wheel cleaned of dust buildup
- Condensate trap and drain flushed on condensing models
- Electrical connections checked for tightness and corrosion
- Door switch, safety limits, and pressure switch verified
- Thermostat operation and heat anticipation verified
- Filter replaced with a correctly sized, appropriately rated filter
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Signs your furnace is overdue
- It needed a nudge — a power cycle or a filter change — to start last winter.
- You hear a longer-than-usual delay between the inducer starting and the burners lighting.
- Registers feel less warm than you remember, or the blower runs longer after burners shut off.
- Dust accumulation around supply registers has increased noticeably.
- A burning-dust smell lingers well past the first firing of the season.
- You have not had the system looked at in two or more heating seasons.
Timing it for a Western New York winter
The useful window is before you depend on the furnace daily — generally September through early November in the Buffalo area. A tune-up in that window gives time to order a part if something is marginal, instead of discovering it during the first serious lake-effect event.
Honest scope
A tune-up is preventive work and performance verification. It is not a repair. If we find a failed or failing component, we will tell you what it is, what correcting it involves, and let you decide — no work happens without your go-ahead.