Your Local Comfort Specialists
Diamond L Plumbing and HVAC delivers dependable HVAC services for homes and businesses across Utah — from Riverton and Herriman on the south end of the Salt Lake Valley, through Utah County towns like Lehi, Provo, and Spanish Fork, and out to Vernal, Naples, and La Point in the Uintah Basin.
Utah's climate is unforgiving on equipment. Summer air temperatures push past 100°F in Provo and Riverton while the Basin swings from triple digits in July to well below zero in January. That range means your air conditioning and heating system work harder here than almost anywhere else, and an HVAC system that isn't sized, installed, and maintained correctly won't make it to its expected lifespan.
As a full-service HVAC company, we handle air conditioning service, heating service, HVAC repair, HVAC installation, and routine maintenance — plus plumbing service and electrical services related to your mechanical systems, so one call covers the whole job.
Residential HVAC Services
Our residential HVAC services cover everything that keeps a house livable through a Utah year:
- Air conditioning repair and AC service — refrigerant, compressors, capacitors, condensate, and airflow on any AC unit
- AC tune up and AC maintenance — spring service that catches small problems before a July failure
- Furnace repair and heating service — ignition, heat exchangers, blowers, and gas valves
- HVAC installation — properly sized replacement systems and new construction
- Heat pumps and dual-fuel systems — increasingly popular in Utah County new builds
- Smart thermostats and zone controls — better home comfort in split-level and multi-story homes
- Air filters, duct cleaning, and indoor air quality solutions
- Emergency HVAC service, 24/7
Every visit is handled by a licensed HVAC technician who arrives with the right parts and diagnostic tools, not a sales script.
Air Conditioning Service and Repair
Air conditioning is the service we're called on most from May through September. A struggling air conditioner rarely dies without warning — it gets louder, cools unevenly, runs constantly, or starts spiking your power bill weeks before it quits.
Common air conditioning system problems we repair:
- Warm air from the vents while the AC system runs nonstop
- Low refrigerant from a leak in the line set or coil
- Frozen evaporator coils from dirty air filters or restricted airflow
- Failed capacitors, contactors, or condenser fan motors
- Clogged condensate drains backing up into ceilings and walls
- A cooling system that short-cycles or trips the breaker
Our air conditioning service starts with an honest diagnosis. If a repair gets you several more seasons out of the air conditioner, we'll tell you. If you're putting money into a 15-year-old R-22 unit, we'll tell you that too.
AC Tune Up and AC Maintenance
An annual AC tune up is the cheapest insurance you can buy on a cooling system. We clean the coils, check refrigerant charge, test electrical connections, verify temperature split, flush the condensate line, and replace air filters. Routine maintenance is what separates an air conditioner that lasts 18 years from one that fails at 10 — and it's far cheaper than a costly repair during a Riverton heat wave.
Heating Service and Furnace Maintenance
When temperatures drop in Heber, Vernal, or the west side of Utah County, heat isn't optional. We service and install furnaces, heat pumps, and dual-fuel systems, and we service all major HVAC brands — American Standard, Trane, Carrier, Lennox, Goodman, Rheem, and more. If another HVAC contractor installed it, we can still maintain it.
Fall furnace maintenance includes a heat exchanger inspection, burner cleaning, gas pressure check, safety control testing, and a full combustion and carbon monoxide check. It's a routine maintenance visit that catches the failures that would otherwise wake you up at 3 a.m. in January.
- American Standard
- Trane
- Carrier
- Lennox
- Goodman
- Rheem
Emergency HVAC Service
HVAC problems don't wait for business hours. Our emergency HVAC service line is staffed around the clock, and we prioritize no-heat and no-cool calls involving small children, older adults, and vulnerable households.
Same-day scheduling is available in most of our service area when you call early in the day.
Emergency service situations we respond to:
- Complete air conditioning failure during a heat advisory
- No heat in freezing conditions
- Any smell of gas — leave the building and call from outside
- Burning or electrical odors from the HVAC system
- Water pouring from an air handler or furnace closet
Indoor Air Quality Services
Air quality is a bigger deal in Utah than most homeowners realize. Winter inversions along the Wasatch Front trap particulates in the valley, and dust and wildfire smoke drive summer air quality down across the state. A tight modern home with a poorly maintained HVAC system recirculates all of it.
Our indoor air quality solutions include:
- High-efficiency media filtration and correct air filters for your equipment
- Duct cleaning and sealing to remove buildup and improve airflow
- Whole-home humidifiers for Utah's very dry winter air
- UV and air purification systems
- Fresh-air ventilation for newer, tightly sealed homes
- Indoor air quality testing and airflow balancing
Better indoor air quality means less dust on surfaces, fewer allergy flare-ups, and an HVAC system that isn't fighting a clogged filter to move air.
HVAC Installation and Load Calculations
A new HVAC system is one of the largest purchases a homeowner makes, and sizing is where most installations go wrong. An oversized air conditioner cools too fast to pull humidity and short-cycles itself to an early death; an undersized one never catches up on a 100-degree afternoon.
Every Diamond L HVAC installation begins with a Manual J load calculation based on your actual home — square footage, insulation, window area and orientation, ceiling heights, ductwork, and elevation. A house in Eagle Mountain at 5,000 feet doesn't load the same as one in Vernal, and neither matches the manufacturer's rule-of-thumb chart.
We install and replace:
- Central air conditioning systems and heat pumps
- Gas furnaces and air handlers
- Ductless mini-splits for additions, garages, and shops
- Complete HVAC solutions for new construction and remodels
- Ductwork design, replacement, and repair
You get upfront pricing before we order equipment — the full installed number, including permits and disposal of the old system. No change orders on install day.
Commercial HVAC Services
We also provide comprehensive HVAC service for offices, retail spaces, restaurants, shops, and light industrial buildings across Riverton, Utah County, and the Uintah Basin — rooftop units, split systems, make-up air, and preventive maintenance agreements that keep your doors open and your equipment under warranty.
Service Area
Diamond L Plumbing and HVAC provides HVAC services throughout Utah, including:
Salt Lake County
- Riverton
- Herriman
- Bluffdale
- South Jordan
- West Jordan
- Draper
- Sandy
- Salt Lake City
- University Park area
Utah County
- Provo
- Orem
- Lehi
- American Fork
- Pleasant Grove
- Spanish Fork
- Payson
- Saratoga Springs
- Eagle Mountain
Uintah County
- Vernal
- La Point
- Naples
- Ballard
- Maeser
- Jensen
Duchesne County
- Roosevelt
- Duchesne
- Myton
- Altamont
Tooele County
- Tooele
- Grantsville
- Stansbury Park
Daggett County
- Manila
- Flaming Gorge area
Not sure whether you're inside our service area? Find us on Google Maps or call — if we serve the surrounding area near you, we'll tell you straight, and if we don't, we'll point you to someone who does.
Why Choose Diamond L
Utah has no shortage of HVAC companies — Aire Serv, the national franchises, the one-truck operations. Here's what makes us different:
- Licensed, insured, local technicians. We live in the communities we serve.
- Upfront pricing. You approve the number before work starts.
- The right promise. We only commit to what we can actually deliver, and then we deliver it.
- All major HVAC brands serviced, including American Standard, whatever's already in your house.
- Plumbing, HVAC, and electrical services under one roof.
- Reliable HVAC maintenance plans that include priority scheduling and repair discounts.
- Clean, respectful work. Drop cloths down, old equipment hauled away.
Your Privacy
We collect only the personal information needed to schedule and complete your service — name, address, phone, and job details. We do not sell your personal information, and we don't share it with third parties for targeted advertising. Any personal information you provide through our contact forms is used to serve you and nothing else.
Schedule Your HVAC Service Today
Whether you need an emergency HVAC repair in Riverton, an AC tune up in Provo, a furnace replacement in La Point, or a maintenance plan for a commercial building in Vernal, Diamond L Plumbing and HVAC is ready.
Contact Us or call (801) 440-4414 to schedule with a local HVAC company that shows up when it says it will.
Explore Our HVAC Services
Frequently Asked Questions
How often should HVAC maintenance be done?
Twice a year — air conditioning service in spring, heating service in fall. In dusty areas like the Uintah Basin, air filters may need changing more often than the label says.
How much does an HVAC service call cost?
We quote upfront pricing before any work begins. Diagnostic fees are disclosed when you book, never after.
Do you offer emergency HVAC service?
Yes — 24/7, including nights, weekends, and holidays, throughout our service area.
How long does an air conditioner last in Utah?
Twelve to fifteen years with routine maintenance, and closer to eight to ten without it. Our summer heat and hard-running conditions shorten equipment life compared to milder climates.
Do you service all HVAC brands?
Yes. We repair and maintain all major HVAC brands, including American Standard, Trane, Carrier, Lennox, Rheem, and Goodman, regardless of who installed the system.
Can one company handle both HVAC and plumbing?
Ours can. Diamond L provides HVAC services, plumbing service, and related electrical services, which matters on projects like water heater replacements, remodels, and new construction where the trades overlap.