Factors That Influence How Frequently You Should Schedule an HVAC Service

Learn about the factors that influence frequency to schedule HVAC service, including HVAC size and specific system requirements. Trust Sandium for expert guidance.

Updated on Oct 22, 2023
5 min read
Factors That Influence How Frequently You Should Schedule an HVAC Service

Your HVAC unit needs routine servicing to function at its peak performance level. But it is important to ask: what is the recommended frequency of air conditioning maintenance? Well, that depends on the AC model, usage, lifespan, and other factors that affect its condition. In general, most air conditioners need servicing at least once annually for your Northern California home or business or both.

Factors affecting HVAC service frequency

Let's look at some of the factors that will influence how often your HVAC unit needs servicing.


The lifespan of the average air conditioner is between 15-20 years. The functionality of an HVAC system diminishes with age and requires more maintenance. But, new models are often more efficient and require less maintenance. Furthermore, sometimes extended warranties cover maintenance costs with newer AC systems. 

Model of the unit

The conventional HVAC system is often bulky and complex, leading to malfunctions or problems. With fewer mechanical components, ductless systems are compact and less susceptible to wear and tear. As a result, ductless mini-split systems require service every two years. Central air conditioning systems, however, require annual servicing. 

HVAC size

The need for repairs and maintenance decreases the smaller the unit because they use minimal cooling energy and have less inner friction. Large-sized models are usually more complex, produce more heat, and need more routine maintenance to be effective.

Frequency of use

With more use, your HVAC can collect dirt and debris, ultimately causing issues with performance and ventilation. The standard is to service the unit every half-yearly for homes with regular usage. But, if you use your air conditioner rarely, yearly maintenance should suffice.

Natural disasters

Homes in areas prone to natural disasters like hurricanes or cyclones require frequent HVAC servicing. Heavy winds and rain can damage your unit and cause it to shut down or malfunction. In relation to this, dirt and debris can choke your AC and reduce efficiency. Ensure that your HVAC unit is serviced by a professional at least once yearly, regardless of where you live.

House pets

Arrange for HVAC maintenance once every six months if you keep pets. Most pets frequently produce allergens when they shed hair that can rapidly collect in an air conditioner and obstruct ventilation. Due to the rise in pet allergies, your AC unit should also be free of pet hair and dander.


A small family produces indoor pollutants due to the moisture released through activities. Your air conditioning system will disperse these particles, which could make the unit work harder and decrease the clean air in your house. Service your HVAC once annually to run efficiently and as often as possible if you have a large household or have external pollution.

The insulation level in your house

It will be difficult for your air conditioning system to keep your home at a desirable temperature if it’s not well insulated. Lack of insulation reduces longevity and necessitates regular maintenance. 

External factors

Your air conditioner works quite hard throughout the summer because of the heat and humidity. Therefore, get your AC unit serviced more frequently to avoid a breakdown during the warmest months of the year. Nevertheless, you can maintain your AC unit less frequently if you reside in a region with mild summers. 

The bottom line: How often should your HVAC get serviced?

An annual or 6-monthly HVAC maintenance appointment lasts one to two hours on average. If you wish to increase the lifespan of your appliance and prevent expensive repairs, you should have regular maintenance done. To get the precise frequency of services required for your air conditioning system, consult with a qualified HVAC professional

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