The air handler is running but the house never gets below 80. The furnace clicks on, blows cool, and shuts down. Pomona summers are long and hot, and a single-family home with a struggling system gets uncomfortable fast. Alliance provides heating and air conditioning service in Pomona and across the Los Angeles and Orange County area — diagnosis first, then a flat price you approve before any work begins. Family owned and operated since 2010, with over 40 years of combined trade experience and a 24/7 emergency line. CSLB 1119845.
What heating and air conditioning service involves
Real HVAC service starts with measurement, not guesswork. A technician checks the thermostat call and staging, then moves to the equipment: capacitors and contactors tested under load, blower wheel and motor amperage, condenser coil condition, and refrigerant performance measured by superheat and subcooling rather than a quick gauge glance. Static pressure across the return and supply tells us whether the problem is the equipment or the ductwork choking it.
On the heating side, we inspect the heat exchanger, burners, igniter or pilot assembly, flame sensor, gas pressure, and flue draft. Dirty flame sensors and cracked or corroded components cause most no-heat calls in older Pomona homes.
A typical visit includes cleaning the condenser coil, replacing or checking the filter, clearing the condensate drain line, tightening electrical connections, and verifying temperature split at the registers. If we find a failed part, you get the repair option and the replacement option with a flat price on each — no mystery invoices, no pressure to buy a system you don't need. When a system is genuinely at end of life, we say so plainly and put the numbers side by side.
Why Alliance for heating and air conditioning service
- Family owned and operated since 2010, with over 40 years of combined experience across Southern California homes.
- Accurate pricing upfront — you approve a flat price before we start. No surprises when the work is done.
- Same-day service and a 24/7 emergency line, because a dead system in a Pomona July isn't a "next week" problem.
- Diagnosis before parts: we measure static pressure, refrigerant charge, and electrical draw so the problem gets solved the first time instead of patched.
- One licensed team for heating, air, plumbing, water treatment, sewer and electrical (CSLB 1119845) — one call for the whole house.
- Free estimates on new installations, plus Senior and Veteran discounts year round.
Our heating and air conditioning service process
- You call. Tell us what the system is doing — no cooling, no heat, short cycling, strange noise, uneven rooms. We schedule same-day when the slot is open, or dispatch on the 24/7 emergency line.
- We diagnose. The technician tests the thermostat, electrical components, blower, refrigerant performance and airflow, and inspects the furnace and duct connections.
- We explain what we found. Plain language, the actual readings, and what caused the failure — not just which part died.
- You approve a flat price. Repair and, where relevant, replacement options priced upfront. Nothing starts until you say go.
- We do the work. Parts replaced, coils and drain lines cleaned, connections tightened, charge verified.
- We verify. Temperature split measured at the registers, amp draw rechecked, and a full heating and cooling cycle run before we leave.
- We clean up. Drop cloths, old parts hauled off, and a written summary of what was done.
What heating and air conditioning service typically costs
Estimates range based on what the system needs. A straightforward repair — capacitor, contactor, flame sensor, condensate clog — sits at the low end. Costs climb with refrigerant type and quantity, blower motor or control board replacement, evaporator coil work, duct repairs, and rooftop or tight attic access common in older Pomona homes. Age matters too: parts for discontinued equipment cost more and take longer to source.
A diagnostic service fee covers the technician's time to find the actual fault, and you'll know that number before we roll. After diagnosis, you get a flat price for the repair, and nothing proceeds until you approve it. Included: full system inspection, cleaning of accessible coils and the condensate line, filter check, and verification testing. Not included: full duct replacement, electrical panel upgrades, or new equipment — all quoted separately, and estimates on new installations are free. Call for a no-pressure quote.
Service areas we cover
- Pomona
- Fontana
- Claremont
- La Verne
- San Dimas
- Diamond Bar
- Walnut
- Chino Hills
- Brea and North Orange County
- Greater Los Angeles County
FAQ
How fast can you get to my Pomona home?
We offer same-day service when the schedule allows, and our emergency line is answered 24/7. Office hours are Monday through Friday 8am–4pm and Saturday 8am–2pm; Sunday the office is closed but the emergency line stays open.
My AC is blowing but the air isn't cold. What's wrong?
Most often it's a failed capacitor, a contactor that isn't pulling in, a frozen evaporator coil from restricted airflow, or low refrigerant from a leak. Adding refrigerant without finding the leak is a patch, not a repair — we look for the cause first.
Should I repair my system or replace it?
It depends on the age of the equipment, the cost of the failed part, refrigerant type, and how the ductwork is performing. We price both options flat, side by side, and let you decide. Estimates on new installations are free.
Do you charge a fee just to come out?
Yes — there's a diagnostic service fee for the technician's time to properly test the system, and you'll know that amount before we're dispatched. Repair pricing is flat and approved by you before any work starts.
Do you handle anything besides heating and air?
We do. Alliance handles plumbing, sewer, water treatment and electrical with the same licensed team, so one call covers the whole house. Homeowners often pair an HVAC visit with plumbing checks — our guides on why water pressure drops during hot Southern California summers and getting your plumbing ready before you leave town are good places to start.
Do you offer any discounts?
Senior and Veteran discounts are available year round. Ask when you call.
If your system is down, don't sit in the heat waiting to see if it fixes itself. Call Alliance at +19516220842 for heating and air conditioning service in Pomona — we'll diagnose it properly, give you a flat price before we start, and solve it the first time. Free estimates on new installations, and the emergency line is open 24/7.