HVAC maintenance checklist: what a tune-up includes

ENERGY STAR recommends a professional check-up every year, cooling in spring and heating in fall. A real tune-up tightens and tests electrical parts, cleans coils, clears the condensate drain, checks refrigerant and the blower, and on a furnace inspects gas pressure, burners and the heat exchanger. Check your filter monthly; change it at least every 3 months.

What a real tune-up includes

ENERGY STAR recommends a contractor check-up once a year: the cooling side in spring and the heating side in fall. Its checklist is a good yardstick for any tune-up offer:

• Check thermostat settings and operation.
• Tighten electrical connections and measure voltage and current on motors.
• Lubricate moving parts that need it.
• Inspect and clear the condensate drain.
• Check the controls and safety, including a normal start and shutdown.
• Clean the evaporator and condenser coils.
• Check the refrigerant level.
• Clean and adjust the blower.
• Heating: check gas or oil connections, gas pressure, burner combustion and the heat exchanger.

Ask for a written report with the readings, not just a checked box. A low refrigerant level means there is a leak; refrigerant is not used up in normal operation. A heat pump heats and cools, so its check covers both halves of the list.

If a technician reports a cracked furnace heat exchanger, ask to see the evidence, such as a photo or camera footage, along with a carbon monoxide reading. It is a serious finding, and a second opinion before replacing the furnace is reasonable.

What it should cost

A tune-up is scheduled, fixed-scope work, so compare its price with a standard diagnostic visit in your area. A tune-up priced far above a service call should list more work in writing. A very cheap tune-up can be a way in the door for a sales pitch, so judge it by the written findings, not the price.

Filters

A clogged filter restricts airflow and makes the system work harder. DOE says routinely replacing or cleaning filters can lower an air conditioner’s energy use by 5% to 15%.

MERV runs from 1 to 16; higher numbers catch smaller particles. A thicker, higher-MERV filter can restrict airflow on some systems, so ask your technician what yours can take.

What you can do yourself

• Check and change the filter.
• Keep leaves, grass and debris away from the outdoor unit.
• Keep supply and return vents open and unblocked.
• Check that the condensate drain line isn’t clogged.
• Replace thermostat batteries and check the settings.
• If you have gas appliances, test your carbon monoxide alarms.
• Turn off power at the disconnect before touching anything on the outdoor unit. Leave refrigerant, gas and electrical work to a licensed technician.

Before you book a repair visit, check the thermostat setting and batteries, the filter, the breaker, and whether the condensate drain is clogged; DOE lists these among the common causes of air conditioner problems. Keep a simple log too: the date, what was done, the filter size and MERV, and the technician’s readings. It helps spot a slow leak or a weakening part.

Maintenance plans: worth it or not

Plans usually bundle one or two visits a year with perks such as priority scheduling or repair discounts. A plan is worth it if its price is at or below what you would pay for the same visits one by one, and if you would otherwise skip maintenance. Before signing, check whether it renews automatically, how to cancel, what is excluded, and what the discount is taken from. Keep every service receipt; some warranties ask for proof of maintenance.

Signs of an upsell

• Duct cleaning pushed as routine. EPA does not recommend routine duct cleaning, only when there is substantial visible mold, pests, or excessive dust and debris.
• A refrigerant top-off every year. That means an unrepaired leak.
• A part declared failed with no reading shown, such as a capacitor’s measured value against its rating.
• A full replacement pitched during a tune-up with no written diagnosis.
• Add-on air cleaners presented as required.
• Pressure to decide on the spot. Purchases beyond the maintenance you asked for fall under the FTC Cooling-Off Rule when sold in your home.

Questions

How often should an HVAC system be serviced? Once a year for each side, per ENERGY STAR: the cooling system in spring and the heating system in fall. A heat pump does both jobs, so its visits cover both.

How often should I change my furnace filter? Check it every month and change it when it looks dirty, at least every 3 months. Heavy-use months may need more frequent changes.

Is duct cleaning part of regular maintenance? No. EPA recommends duct cleaning only as needed, for example for substantial visible mold, pests, or excessive dust and debris, and says not to hire cleaners who push it as routine.

Are HVAC maintenance plans worth it? They can be if the plan costs no more than the visits would separately and you would otherwise skip maintenance. Read the renewal, cancellation and exclusion terms first.

Sources

• ENERGY STAR: Maintenance checklist — https://www.energystar.gov/saveathome/heating-cooling/maintenance-checklist
• ENERGY STAR: Heat and cool efficiently (filters) — https://www.energystar.gov/saveathome/heating-cooling
• DOE: Energy Saver 101, home cooling — https://www.energy.gov/sites/prod/files/HomeCooling101-final.pdf
• EPA: What is a MERV rating? — https://www.epa.gov/indoor-air-quality-iaq/what-merv-rating
• EPA: Should you have the air ducts in your home cleaned? — https://www.epa.gov/indoor-air-quality-iaq/should-you-have-air-ducts-your-home-cleaned
• FTC: The Cooling-Off Rule — https://consumer.ftc.gov/articles/buyers-remorse-ftcs-cooling-rule-may-help