If your home has two systems, compare them
When separate systems serve different rooms, note which thermostat controls the affected area. Do not assume both outdoor units need refrigerant because one zone feels warm.
For a single system with multiple zones, the issue may involve airflow or controls rather than a leak. Tell the technician whether doors, vents or zone settings changed before the problem began.
Maintenance does not mean an automatic refill
A maintenance check can include filters, coils, drains, controls, electrical checks and charge assessment. ENERGY STAR recommends checking the refrigerant level and adjusting when necessary, not topping off every system each year.
If a recharge is recommended, ask what measurement supports it and which refrigerant the manufacturer specifies. A can sold for vehicle air conditioning is not appropriate for a home system.
Confirm service at the property
Give the provider the actual property city and ZIP code, not the location of your mobile phone. A Palm Desert page or telephone area code does not establish contractor coverage. Ask the company to confirm availability, equipment type, visit fees and access requirements.
Make the first checks simple and safe
Set the thermostat to Cool, fan to Auto and the temperature below room temperature. Look at an accessible filter and replace it according to the equipment instructions if dirty. Keep supply vents and return grilles clear.
If you see ice, smell burning or have repeated breaker trips, stop operating the equipment and get professional help. Do not keep resetting a breaker or try to add refrigerant yourself.
Approve a clear scope of work
Ask for an itemized estimate covering diagnosis, leak detection, repair and refrigerant. Ask what warranty applies and what checks will be made afterward. The receiving company, not this website, sets prices and appointment availability.
Sources behind this guide
General guidance, not a diagnosis of your equipment.
