Honest heating & air, done right.
Mini-splits, heat pumps, and full system replacements across LA’s Westside. Straight answers, fair pricing, and a job site left cleaner than we found it.
“They arrived on time, they were clean and neat, and they did exactly what they said they would do.”
RLM · Culver CityCooling, heating & everything between
Ductless Mini-Splits
Room-by-room comfort without ductwork. Sized honestly, often with fewer units than you’d think.
Heat Pumps
One efficient, all-electric system for both heating and cooling. Ideal for LA’s climate.
Central AC & Furnace
Full replacements of aging systems: condensers, air handlers, and furnaces. Often done in one day.
Emergency Repair
AC down in a heatwave? Fast response, honest diagnosis, and a realistic timeline. No runaround.
Rooftop & Package Units
Crane-assisted rooftop replacements for homes, apartments, and commercial buildings. Permits handled.
Maintenance & Tune-Ups
Annual service, filters, and coil cleaning. Like an oil change for your system: small cost, long life.
John Castillo answers his own phone
John grew up around mechanical work (his father was a car mechanic) and he runs 310 HVAC the same way: show up on time, explain your options in plain English, and treat every home like his own.
“I never upsell or try to get rich off of a customer. My goal is always to build a lifelong relationship.”John Castillo, owner
The Westside keeps our number saved
“Johnny is like an old school craftsman. His estimate came in exactly at what I thought it should cost. It was like clockwork.”
RLM · Culver City“John told me I only needed air conditioning in certain rooms and it would cool the whole house. And he was right!”
Kiki · Torrance“His team was there at 6 am. They are fast and they left no mess behind, so there were no disruptions.”
Shane · Inglewood (commercial)Based in Mar Vista.
All over the Westside.
From Malibu to El Segundo, and for the right job, anywhere in greater LA.
Get a straight answer today.
Free estimates · Same-day service when you need it