Seasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
Before
After
Before
After
Before
AfterHVAC Company in San Lorenzo, CA
Most HVAC work in San Lorenzo means retrofitting David D. Bohannon’s post-WWII tract homes, built in the late 1940s and early 1950s without central air conditioning and with crawl-space ductwork now past 70 years old. Coldharbour Heating & Air dispatches crews from our San Francisco Bay Area office to handle AC repair, furnace repair, and AC installation across these uniform ranch-style homes, where the same floor plans and failure points repeat block after block. Call (817) 402-2972 and a live person answers, 24 hours a day.
Why San Lorenzo Homes Are Different
San Lorenzo sits far enough inland from the bay that Diablo wind events and summer heat waves push temperatures into the low-to-mid 90s°F, consistently hotter than coastal Hayward or San Leandro just to the west. Yet cool, damp marine-layer nights suppress the perceived need for air conditioning among longtime residents, so many households delay installation until a heat emergency strikes. This pattern drives a surge of reactive AC installation calls during June through September rather than planned spring upgrades.
The housing stock compounds the challenge. Nearly every home is a small 2-3 bedroom wood-frame ranch built quickly for returning veterans, with minimal insulation and no provision for central cooling. Crawl-space ductwork is nearly universal, and after seven decades the flex duct or metal duct in those damp under-floor spaces is frequently crushed, rodent-damaged, or fully disconnected. A technician who has completed one attic or crawl-space duct retrofit here has essentially seen every house on the block, the same joist spacing and trunk-line routing repeating street after street.
Our Main San Lorenzo Services
San Lorenzo homeowners call us most often for these three services, each with its own dedicated page.
AC Repair in San Lorenzo
AC repair calls in San Lorenzo spike during Diablo wind events, when temperatures jump 20 degrees overnight and systems that ran fine in coastal cool suddenly strain. We see a lot of capacitor failures and refrigerant leaks in first-time AC units added to Bohannon homes never designed for cooling loads, plus blower motors overworking against collapsed crawl-space ducts. Our technicians carry capacitors, contactors, and refrigerant on every truck, and every repair comes with our written 365-Day Done Right Promise. AC Repair in San Lorenzo
Furnace Repair in San Lorenzo
Furnace work here means servicing original or replacement units heating through those same compromised duct systems. We regularly find igniter failures and limit switches tripping in older Goodman and Rheem furnaces, often because disconnected crawl-space ducts cause the unit to overheat cycling against insufficient airflow. Before any repair begins, we hand you a written price, and if the same repair fails within 365 days, we return at no charge. Furnace Repair in San Lorenzo
AC Installation in San Lorenzo
AC installation in San Lorenzo is almost always a first-time retrofit, adding cooling to a home that has never had it. We size the system for actual load, replace or seal deteriorated crawl-space ductwork, and coordinate permit paperwork. Because the Bohannon floor plans are so uniform, we can quote accurately and schedule a firm install date, not a vague window. Financing and rebate paperwork is handled in-house. AC Installation in San Lorenzo
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in San Lorenzo
Our technicians train on nine major residential HVAC brands and carry common parts for Trane, Lennox, Goodman, and Rheem on every San Lorenzo truck. Most same-day repairs stay same-day because we are not waiting on a parts run. See our brands for the full list.
Pricing for HVAC Company in San Lorenzo, CA
| Service | Typical range in San Lorenzo |
|---|---|
| AC Repair | $150-$650 |
| Furnace Repair | $150-$700 |
| AC Installation | $3,500-$7,500 |
| Tune-Up | $80-$200 |
Prices in San Lorenzo trend toward the higher end when we are replacing collapsed crawl-space ductwork alongside the main repair, or when a first-time AC installation requires new electrical circuits and pad work. The written price we hand you before any work begins is the price you pay, no exceptions.
Neighborhoods We Serve in San Lorenzo
We cover the full San Lorenzo ZIP and surrounding unincorporated Alameda County pockets, with crews typically arriving within the scheduled window across all areas.
- Bohannon Tract
- San Lorenzo Village
- Hesperian Gardens
- Meekland area
- Ashland adjacencies
Service Area – Cities Near San Lorenzo
Our crews work throughout the East Bay corridor surrounding San Lorenzo. We regularly dispatch to Castro Valley, CA for hillside homes with different duct challenges, San Leandro, CA for coastal-climate cooling loads, and also cover Union City, GA and Oakland, FL within our broader service footprint.
Serving San Lorenzo, CA - Our Local Coverage Area
We’re based in the San Lorenzo area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About HVAC Company in San Lorenzo
We answer calls live 24 hours a day, and our San Francisco Bay Area dispatch coordinates same-day arrival for true emergencies like no heat on a cold night or complete AC failure during a Diablo wind heat event. Call (817) 402-2972 for current availability.
Yes, first-time AC installations in San Lorenzo’s unincorporated Alameda County jurisdiction require permits for electrical and mechanical work. We pull permits and schedule inspections as part of every installation, included in your fixed written price.
Disconnected or crushed crawl-space ductwork is the culprit in most Bohannon tract homes. We inspect the full duct run with every service call and will show you exactly what we find before quoting any repair.
What happens when you call
- 1A real person answersNo phone trees - talk to a local hvac pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What San Lorenzo Customers Say
"Furnace was short cycling all winter. They diagnosed a bad sensor instead of condemning the whole unit like I feared. Cheap fix, honest call."
- Russ Tiedemann"Thermostat and a weak blower. Fixed both in one visit, explained the guarantee, and didn't leave a mess. I've already recommended them to my neighbor."
- Natalie Esposito"Honest to a fault. Two companies told me I needed a whole new unit. Coldharbour said mine had years left and just needed a cleaning and a part. Saved me thousands."
- Marcus Reilly