AC maintenance in San Diego: the yearly check-up and what you can do

AC maintenance is how you find the weak part before the hot week instead of during it. This guide covers AC service in San Diego the way ENERGY STAR describes it: what a contractor checks at a yearly tune-up, when to book it, and the simple jobs you can do yourself.

Air Conditioning Repair San Diego is an independent referral service, not an air conditioning or HVAC company. Calls and form requests are passed to an independent local AC and HVAC contractor, who can contact you about your system; that contractor gives any quote and does any work.

When to book AC service in San Diego

ENERGY STAR recommends annual pre-season check-ups by a contractor, and puts the timing simply: check the cooling system in the spring and the heating system in the fall. In San Diego that timing fits the weather well. NOAA’s 1991 to 2020 normals for Lindbergh Field show August and September as the warmest months at the coast, with average highs of 77.3 F and 77.2 F, and inland neighborhoods often run warmer. A check in the spring gets the AC ready well before then.

If you have a heat pump, it does both jobs, so it is worth having it looked at before each season it works hardest in.

What an AC tune-up covers

ENERGY STAR’s maintenance checklist lists what a typical contractor check-up includes. Use it to compare what different contractors offer, and to ask what was done after the visit:

Item	What the contractor does	Why it matters
Thermostat	Checks the settings	The system cools when you want it to
Electrical	Tightens connections, measures voltage and current on motors	Motors get the power they need
Moving parts	Lubricates them	Parts move freely
Condensate drain	Checks and clears it	A plugged drain can cause water damage and affect indoor humidity
Controls	Checks the starting cycle and controls	The system should start, run and shut off properly
Coils	Cleans the evaporator and condenser coils	Clean coils help move heat out of the house
Refrigerant	Checks the level	Too much or too little refrigerant makes the system less efficient
Blower	Cleans and adjusts blower parts	Airflow problems can reduce efficiency by up to 15 percent

What you can do yourself

The filter, once a month

ENERGY STAR’s do-it-yourself advice is short: inspect, clean or change the air filter once a month in your central air conditioner, furnace or heat pump. A dirty filter can increase energy costs and damage your equipment, leading to early failure. Some months the filter will look fine; checking costs nothing. The article how often to change your AC filter covers where to find it and what to look for.

The drain

Look at the indoor unit now and then for water in the drain pan or on the floor. The condensate drain is on ENERGY STAR’s check-up list because the water has to go somewhere, and ENERGY STAR notes that it can cause water damage in the house.

The outdoor unit

Keep leaves, boxes, plants and garden tools away from the outdoor unit so air can move freely through it. Trim back shrubs that have grown in around it. Do not hose hard into the fins or take the cover off. Cleaning the coil properly is part of the contractor’s check-up.

The thermostat

Check that the thermostat is set to cool and to a sensible temperature, and replace its batteries if it uses them. A blank screen or a thermostat that does not respond is worth mentioning when you book.

Coast and inland: what San Diego adds

Homes near the coast, in Pacific Beach, Ocean Beach, Point Loma or La Jolla, live with salt air. Homes inland, in Mira Mesa, Rancho Bernardo, Santee or El Cajon, often run warmer than the coast and can see more dust. Both are general reasons to keep the outdoor coil clean and the filter checked. Ask the contractor what they see on your outdoor unit at the check-up, and whether anything needs attention before it fails.

Do not forget the heating side

The same ENERGY STAR advice that puts the cooling check in the spring puts the heating check in the fall. In San Diego the heat may not run often, but a furnace or heat pump that sat unused all summer still deserves a look before it is needed. The monthly filter advice also covers the furnace and the heat pump, not just the central air conditioner: in many homes the cooling and heating share one blower and one filter, so one check serves both. If you have a heat pump, it is one system doing two jobs, and a check before each season helps keep both sides ready.

Keep a simple record

A short record makes each visit more useful. Note the date of each check-up and what was found, the filter size and the date you last changed it, and any repair done. Keep the permit and test records from the installation with it. When a contractor comes out, that record answers their first questions quickly, and it shows a pattern if the same part keeps coming up. It also helps later, if you ever weigh repairing or replacing the AC.

Signs the AC needs service now

• Air from the vents is not as cold as it was
• The system runs longer than it used to on a warm day
• Water in the drain pan or around the indoor unit
• Ice on the refrigerant lines or the indoor coil
• New noises, a burning smell, or a system that starts and stops every few minutes

Any of these is a repair question rather than a tune-up. Start with AC not cooling? What to check first, then call the number on this page or send the form.

If the check-up finds nothing wrong, that is a good result, not wasted money: it means the coils are clean, the drain is clear and the electrical parts tested well before the hottest weeks of the year arrive.

AC maintenance or AC repair?

Maintenance is planned and preventive: the same list each year, done before the system is under strain. Repair is finding and fixing a part that has already failed. A check-up can turn up a part that is close to failing, such as a worn electrical part or a coil that needs cleaning. Ask for anything found in writing, with a price, and decide whether to fix it then. For a repair, the homepage guide to AC repair explains how a repair visit works.

Questions to ask when you book

1. Which items from the ENERGY STAR check-up list will you cover?
2. Will you clean both the indoor and outdoor coils?
3. Will you check the refrigerant level, and how are the technicians certified under EPA Section 608?
4. Will you clear the condensate drain?
5. Will you give me a written note of what you found and any repairs you suggest?

The HVAC contractor guide explains how to check a contractor’s C-20 license on cslb.ca.gov before the visit. If the system is old and repairs keep coming, the AC replacement guide sets out the questions to ask.

This site is about home air conditioning. For a car’s AC, an auto repair shop is the place to ask.

Questions people ask