A maintenance visit is only as good as what gets measured. Here is what a thorough one includes, and why each reading matters.
Key takeaways
- A thorough tune-up produces measured readings, not just a tick-box sheet.
- Parts drift out of spec before they fail, and catching the drift costs very little.
- Most manufacturers require documented annual maintenance for the parts warranty.
- Cooling in spring, heating in fall. Heat pumps run year-round and want both.
From the shop on East Main Street in Church Hill
What a thorough visit includes
- 01
A thorough visit produces numbers
A thorough visit produces numbers: refrigerant charge verified against superheat and subcooling, capacitor capacitance measured against its rated microfarads, motor amp draw compared to the nameplate, temperature rise or split measured against the manufacturer’s specified range, static pressure across the system, and combustion analysis on anything that burns fuel.
- 02
Parts drift before they fail
Those numbers matter because components rarely fail without first drifting out of specification. A capacitor at 70% of rating still works today and will not survive the summer. Catching that costs very little; letting it take the compressor with it costs thousands.
70%of its rated microfarads: still working today, and it will not survive the summer. - 03
The warranty depends on the paperwork
There is a warranty dimension too. Most manufacturers require documented annual maintenance as a condition of the parts warranty. Keep the paperwork — it is what a claim gets assessed against.
- 04
Spring and fall
Cooling should be done in spring, heating in fall. Heat pumps run year-round and want both.
Service recordWhat should be measured on every visit
- Refrigerant charge verified, not just topped up
- Capacitors measured against rated microfarads
- Motor amp draw compared to nameplate
- Temperature rise or split against specification
- Static pressure measured across the system
- Combustion analysis on fuel-burning equipment
- Condensate drain cleared and float switch tested
- A written record of every reading taken
Common follow-ups
How do I know my tune-up was thorough?
Ask for the readings. A thorough visit produces measured values — charge, amp draws, capacitance, temperature rise. If the paperwork is a checklist with no numbers on it, very little was measured.
Does maintenance keep my warranty valid?
For most manufacturers, documented annual maintenance is a condition of the parts warranty. It is one of the few pieces of paperwork worth filing.
Would you like help with your own system?
Free estimates on new equipment. We measure before we quote.
(423) 357-1922