Supply/return temperature split
The 15–20°F story, and when it lies.
A 12°F split with iced lines is not “close enough.” We use split with airflow, not instead of it.
If the indoor fan runs but the house stays hot, the outdoor unit, refrigerant circuit, or airflow is the real question — not “add Freon and leave.”
Use this as a field guide to AC temperature split, then book a visit if the house still misbehaves.
We test temperatures, static pressure, electrical on the condenser, and whether the coil is iced. A $69 diagnostic documents the reading before any repair quote.
We map AC temperature split to the actual failed part or design limit. Age of the system is a data point, not the diagnosis.
You approve any repair after the findings are written down. Diagnostic visits are a flat $69. New installation estimates are free in-home with a load calculation — not a number invented from square footage on Zillow.
A “recharge” without a leak test is a second service call in two weeks. We do not top off a sealed system as a business model.
A company that skips testing on AC temperature split will skip it on the next call too. We would rather lose a job than install the wrong thing.
Related service page on this site: air conditioner repair. The article you are reading is the explanation; that page is how to book the work.
OTTER HVAC is based at 2939 Santos Ln, Walnut Creek. Alamo, San Ramon, and Livermore are regular routes, along with the rest of our listed East Bay cities. Hours are 7am–5pm, seven days a week. We do not advertise 24/7 because we do not staff a night shift.
Inland heat (Pleasanton, Livermore, Concord) and marine air (Alameda, Daly City) are different loads. A note written for Alamo is not automatically right for a fog-belt house. We treat them that way.
Category on this guide: Cooling. Primary search phrase: AC temperature split.
Call (650) 900-0440 or book online. Tell us the city, the symptom in one sentence, and the brand if you know it. If we have a window today, we will say so. If we do not, we will say that too.
Technicians are EPA 608, OSHA, and NATE certified. Public reviews average 5.0 stars across roughly 146 Google and 151 Yelp reviews. That does not replace a test on your unit.
Related service: Air Conditioner Repair. Book a $69 diagnostic or a free install estimate. Hours: 7:00am–5:00pm, seven days a week. Shop: 2939 Santos Ln, Walnut Creek, CA 94597.
Related: All HVAC guides · Air Conditioner Repair · Pricing and $69 diagnostic · Contact OTTER HVAC
Frequently asked questions
What do you test on a AC temperature split visit?
We test temperatures, static pressure, electrical on the condenser, and whether the coil is iced. A $69 diagnostic documents the reading before any repair quote. The visit is a flat $69. Repair work starts only after you approve the written findings.
Will you quote AC temperature split from a photo?
No. We do not price AC temperature split from a driveway photo. $69 diagnostic, then a quote — or a free in-home install estimate if replacement is the honest path.
Do you handle this in Alamo and San Ramon?
Yes. We run Alamo, San Ramon, and the rest of our East Bay list from 2939 Santos Ln, Walnut Creek. Hours are 7am–5pm every day — not 24/7. Call (650) 900-0440.
Explore related pages
References and credentials
- U.S. DOE Energy Saver
- EPA Section 608
- EPA Section 608 refrigerant certification
- U.S. Department of Energy — Energy Saver
Authority sources: U.S. DOE Energy Saver · EPA Section 608