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Heating & Air

Maintenance and Tune-Ups

A seasonal visit is worth having, and we are still not going to tell you it adds years to your furnace. Nobody has measured that. What is documented is a short list of things a technician can find in April or October, and that list is the honest reason to book one.

Here is the pattern every year. The first genuinely hot week lands and every marginal air conditioner in the county quits inside about four days. January does the same to heating. Whoever is already on a schedule gets seen first. That is queueing, not engineering.

The better question is what a technician can find before the season starts. Some of it is documented. Much of what gets sold alongside it is not.

Gas furnace with the front panel removed, showing burners and controls, with a new filter and meter beside it
Furnace open for a tune up, new filter and meter on the cabinet.

The claim we are not going to make

Nearly every maintenance page in this trade promises your equipment will last longer, and some put a number on it. We went looking for the research. There is none. DOE does assert, in its own voice, that 'periodic maintenance can extend the life of your heating system and minimize efficiency loss', and EPA says much the same about air conditioners. Neither cites a study, and no source anywhere puts a figure on the years it buys you. So 'adds five to ten years' was invented by whoever typed it.

Same with the bill. We will not quote a percentage off your energy cost for a tune-up, because no agency publishes one. The only savings figure we found attached to a named task belongs to the filter, and that is the job you do yourself.

What is documented is the mechanism, task by task

EPA's ENERGY STAR Heating and Cooling Guide does what the sales pitch does not. Rather than promise a lifespan, it ties named tasks to named consequences. It is dated 2009, so read it as settled guidance rather than news. One line is worth quoting exactly: 'Dirt and neglect are the top causes of heating and cooling system inefficiency and failure.'

  • Coil cleaning. ENERGY STAR: a dirty coil 'causes the system to run longer, increasing your energy costs and shortening the life of your equipment.'
  • Refrigerant charge. 'Too much or too little refrigerant charge can damage the compressor, reducing the life of your equipment.' The guide puts the penalty of a wrong charge at 5 to 20 percent of efficiency.
  • Electrical connections. Faulty ones 'can cause your system to operate unsafely and reduce the life of major components.' Hence amp draw, rather than just looking.
  • Lubrication. Lack of it 'can also cause equipment to wear out more quickly, requiring more frequent repairs or replacements.'
  • Burner condition. Improper burner operation can come from a dirty burner or a cracked heat exchanger, and either makes the equipment run less safely.
  • Capacitor and start relay. Copeland, which builds the compressors in much of this equipment, documents a failed capacitor burning out a compressor start winding. A cheap part takes out an expensive one. What we will not tell you is that capacitors are the most common HVAC failure. That line is everywhere and has no source.

Copeland's framing is the part worth carrying home. A compressor that died electrically usually died of something mechanical first: oil dilution, liquid floodback, overheating on a low charge. Replace it without finding the cause and you buy the failure twice.

Carbon monoxide is not an old furnace problem

This finding changed how we talk about the autumn visit. In a staff draft advance notice of proposed rulemaking dated 31 July 2019, Consumer Product Safety Commission staff reported that 'the majority of the CO incidents occurred from appliances that were reported to be 15 years old or less at the time of the incident, and the average age of appliances involved in CO incidents was 9.6 years.' Staff add that these were modern appliances carrying the latest safety devices, and that those devices were not capable of protecting against the exposure. Read that twice if your furnace is eight years old.

The same analysis separates how CO gets made from how it gets into the house, and the second list is where the cases sat. Across 83 cases, disconnected or breached vents, chimneys or heat exchangers were the most cited primary failure mode at 19.3 percent, 16 of the 83. Blocked vents and chimneys followed at 18.1 percent. Together, 31 of 83 cases, about 37 percent. So the flue earns as much attention as the furnace body, which is not how most checklists are built. CPSC also gives you a sign you can see: leakage through cracks can leave black stains on the outside of the chimney.

What goes on the list, and the paper behind each line

What a seasonal visit covers, and where the justification comes from
CheckedDocumented reasonSource
Flue and vent, gas heatBreached or blocked venting was the most frequently cited CO pathway, 31 of 83 casesCPSC staff draft ANPR, 31 July 2019
Burner, flame and combustionImproper burner operation from a dirty burner or a cracked heat exchanger operates less safely and less efficientlyENERGY STAR Heating and Cooling Guide
Refrigerant charge, measured not topped upToo much or too little can damage the compressor and shorten equipment lifeENERGY STAR Heating and Cooling Guide
Condenser and evaporator coilA dirty coil makes the system run longer and shortens equipment lifeENERGY STAR Heating and Cooling Guide
Electrical connections and amp drawFaulty connections can cause unsafe operation and reduce the life of major componentsENERGY STAR Heating and Cooling Guide
Lubrication of moving partsLack of lubrication wears equipment out fasterENERGY STAR Heating and Cooling Guide
Condensate drain, float switch and attic panVirginia requires a secondary pan or overflow protection under an attic coil, 1.5 inches deep and 3 inches larger than the coil each wayVirginia Residential Code M1411.3.1
Filter conditionA clogged filter restricts airflow, cutting the unit's ability to coolDOE Energy Saver 101: Home Cooling
Flue sizing and condition after any appliance swapRequired on replacement of a fuel-burning appliance, and certified in writing where the county does not inspect itUSBC Section 113.3.1

Filters are the part you own

Two federal agencies word this differently and you should see both. ENERGY STAR says check the filter every month, especially in winter and summer, and change it if dirty or at least every three months. DOE says clean or replace filters monthly or as recommended. The widely copied 'every one to three months' is nobody's official wording. DOE does attach a number, the only savings figure on this page: routinely replacing or cleaning air filters can lower an air conditioner's energy consumption by 5 to 15 percent. Note whose job that is. ENERGY STAR's own checklist says a contractor can show you how to do some of this yourself.

The appliance nobody opens the panel on

A gas water heater sits in the same room and rarely gets opened until it leaks. The mechanism decides whether maintenance helps. InterNACHI's course material explains that the tank holds a constant supply of fresh, oxygen-rich water, so steel wants to corrode and a sacrificial anode rod is immersed to be attacked instead. Once the anode is gone the tank corrodes, and failure arrives as rust at the bottom and a wet floor.

The schedule we work from is a manufacturer's. Bradford White, reproduced in InterNACHI's course document, asks for the burner and flame colour checked every six months, the TPR valve checked once a year, the vent system inspected at least once a year, and the anode inspected every two years and replaced when necessary. One honest wrinkle. Bradford White's documented draining instruction is a gallon drawn off monthly, not the annual full flush the trade sells. Rheem recommends annual flushing and puts the anode interval at three to four years. Two manufacturers, two schedules, no code behind either. InterNACHI goes further and calls it debatable whether replacing an anode is worth the cost, since the unit is easy to damage during the swap and some warranties can be voided. Water heater repair and installation covers replacement.

The Virginia rule that surfaces at the worst moment

If a fuel-burning appliance gets replaced in your house, USBC Section 113.3.1 requires an inspection confirming the connected vent or chimney is sized per the IRC and is 'clean, free of any obstruction or blockages, defects, or deterioration, and are in operable condition.' Where the building department does not inspect it, whoever did the work must certify to the building official that both are true. That is the step a cheap swap skips, and it is a Virginia amendment rather than base model code.

Permits, since people ask. A tune-up is not permitted work. A replacement is. USBC Section 108.1 pulls in any alteration of a mechanical or fuel supply system, and the ordinary repairs exemption in 108.2 only covers appliances not fuelled by gas or oil. In Prince William County inspections are booked by 3 p.m. the working day before.

What we will not use the visit to sell you

The 50 percent rule, where repairs costing more than half the price of a new unit mean replacement, has no authority behind it. We looked. Not a code, not a standard, not a government publication, not an insurance study. It lives in contractor marketing and in an article by Rheem, a manufacturer. ENERGY STAR does publish age triggers, over 10 years for a heat pump or air conditioner and over 15 for a furnace or boiler, but read what they are: conditions for considering replacement, listed beside rising repair frequency and rooms that will not hold temperature. When something does fail, AC repair and installation and furnace repair and installation lay out the decision, and heat pumps covers the box that does both.

How the plan actually works

Two visits a year, cooling in spring and heating in autumn. That cadence is ENERGY STAR's, and its stated reason is contractor availability rather than anything mechanical, so we will not pretend April is kinder to a condenser than July. We book them so you do not have to remember. Priority in the weeks the phone does not stop. A written record of what we measured, so a reading that has drifted for three years is visible before it strands you. No long-term agreement. This runs month to month and 30 days notice ends it. We will not tell you what your warranty requires either, because we have not read your paperwork. Keep the records whoever does the work.

Office hours are 7 to 5 and a real person picks up. After hours the calls go to Jon himself, which is why we say plainly that we do not promise a truck at 3 a.m. Family owned, 40 plus years in the trade, Virginia Class A licence 2705131990.

Common Questions

Will a tune-up make my system last longer?
Probably, and we cannot prove it. DOE and EPA both assert that maintenance prolongs equipment life, neither cites research, and no source puts a number of years on it. The individual mechanisms are documented, which is what this page is built on.
How much will a tune-up cut my energy bill?
We will not give you a number, because no agency publishes one for a tune-up. The quantified task is the filter: DOE says routinely replacing or cleaning filters can lower an air conditioner's energy consumption by 5 to 15 percent, and that is yours to do.
How often should I change the filter?
ENERGY STAR says check it monthly, especially in winter and summer, and change it if dirty or at least every three months. DOE words it as monthly or as recommended.
Do I really need two visits a year?
ENERGY STAR's cadence is cooling in spring and heating in the fall, and its stated reason is contractor availability. A heat pump is the strongest case for both, since it works in both seasons.
My furnace is only eight years old. Why would it need a combustion check?
Age is a poor filter for this risk. CPSC staff reported that the average age of appliances involved in carbon monoxide incidents was 9.6 years, that the majority were 15 years old or less, and that the safety devices fitted to them did not protect against the exposure.
What gets checked on the flue?
Sizing, blockage, defects and whether it is intact and drafting. In CPSC staff's review of 83 cases, breached or blocked venting accounted for 31 of them, about 37 percent. You can check the chimney exterior yourself: CPSC says leakage can leave black stains.
Does a cracked heat exchanger mean I need a new furnace?
We shut it down and show you, then we are straight about the evidence. CPSC documents that a breached heat exchanger is a route for combustion products into the house. No government or standards body publishes the rule that a crack cannot be repaired. That part is trade judgment.
Is the 50 percent repair-versus-replace rule real?
Not as an authority. It appears in contractor marketing and in a Rheem article, and in no code or standard or government publication. What decides it is which component failed, the condition of the rest of the system, and what a repeat failure would cost you.
Does a tune-up need a permit?
No. Replacing equipment usually does. USBC Section 108.1 covers alterations to mechanical and fuel supply systems, and the ordinary repairs exemption does not reach appliances fuelled by gas or oil.
Should I have the anode rod replaced in my water heater?
Inspect before deciding. Bradford White asks for an inspection every two years with replacement when necessary, Rheem says every three to four years, and InterNACHI calls it debatable whether the swap is worth the cost, since the tank is easy to damage and some warranties can be voided.
Am I locked into a contract?
No. There is no long-term agreement on anything we do. The plan runs month to month and 30 days notice ends it.
Is somebody there if the heat quits on a Sunday?
The office runs 7 to 5 with a real person answering, and after hours Jon takes the calls himself. We will not promise a truck at 3 a.m.
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