Our Services
Reliable Solutions for Every Need
Residential and light commercial HVAC across Metro Phoenix — every major brand, diagnosed before it's quoted.
What does RM III actually work on?
RM III AC & Heating is a family-owned, licensed and insured contractor (ROC #332513) based in Laveen Village. Raul Mori is the third generation in his family to work this trade, with 27 years on Phoenix roofs and in Phoenix attics. We cover 29 services across residential and light commercial work, on all makes and models, and we're an authorized Day & Night dealer.
How we quote: every call starts with a diagnosis, not a price sheet. We confirm the actual fault — airflow, refrigerant charge, electrical, duct sizing — before anyone discusses replacement. Plenty of systems we're called out to “replace” need a capacitor, a clean coil, or a corrected duct run. When a system genuinely is past saving, you get the math: efficiency, repair history, and what a right-sized replacement costs. Replacement estimates are free, we'll review a written quote from another company at no charge, and we price-match equivalent equipment and warranty terms.
New to any of these terms? The HVAC glossary defines SEER2, Manual J, MERV and the rest in plain English, and the Learning Center covers costs, comparisons, and troubleshooting before you spend anything.
Air Conditioning
When to call us
- Blowing warm air, or never reaching the thermostat setting
- Ice on the refrigerant lines or the indoor coil
- Short cycling, or running nonstop as bills climb
- Grinding, clanging, or a burning smell at startup
If you wait: Left alone, a struggling compressor usually fails on the hottest day of the year — when parts and crews are hardest to get.
Heating
When to call us
- Furnace blowing cold air, or not igniting at all
- Burner cycling on and off before the house warms up
- Rooms that never catch up on a cold desert night
- First cold snap after a long summer of no use
If you wait: Phoenix heating sits idle most of the year, so faults stay hidden until the first cold night — a pre-season check is cheaper than a January emergency call.
Heat Pumps
When to call us
- Weighing a heat pump against a straight-cool replacement
- Wanting one system to handle cooling and heating
- Chasing SRP Cool Cash or federal efficiency incentives
- An existing heat pump that's lost capacity or won't defrost
If you wait: A heat pump sized by rule-of-thumb instead of a load calculation runs harder, costs more to operate, and wears out early.
Ductless Mini-Splits
When to call us
- An addition, casita, or converted garage with no ductwork
- One room that never cools no matter the thermostat setting
- A bonus room over the garage running hot all summer
- Wanting zoned comfort without opening up ceilings
If you wait: Oversizing a mini-split to 'be safe' makes it short-cycle, which leaves the room humid and shortens the compressor's life.
Indoor Air Quality
When to call us
- Dust resettling within a day of cleaning
- Allergy symptoms that get worse indoors
- Monsoon humidity or musty odors from the vents
- Wildfire smoke days when opening a window isn't an option
If you wait: Leaky ducts pull attic dust straight into the air you breathe and waste the cooling you already paid for.
Controls & Maintenance
When to call us
- Running an old or non-programmable thermostat
- A smart thermostat that was never wired or configured properly
- Wanting to catch failures before the first 110° week
- Protecting manufacturer warranty terms on newer equipment
If you wait: Most smart-thermostat disappointment is an install problem — wrong wiring, no C-wire, staging never configured — not the product.
How fast can you get here?
These aren't services you book — they're how RM III responds when something fails. Serving 30 communities across Metro Phoenix from the Laveen Village shop.
Same-Day Service
Most service calls dispatched the same business day across Metro Phoenix.
After-Hours Repair
Support outside normal business hours when a system fails at the worst time.
24/7 Emergency Dispatch
Round-the-clock dispatch for cooling and heating emergencies.
Not sure we reach you? Check the full service area.
What's settled before the work starts?
Pricing, brand compatibility, and what happens if you want a second opinion — all agreed up front.
Free estimates on replacements
Replacement quotes and indoor-air-quality assessments are at no cost and no obligation.
Free second opinion
Already have a written quote from another Phoenix company? We'll review it free — including when the honest answer is that their quote was fair.
Price-match guarantee
Bring a written quote on equivalent equipment, spec, and warranty terms and we'll meet it.
Authorized Day & Night dealer
We sell, install, and service the full Day & Night line — and we service every other major brand, whatever's already on your roof.
Financing through Hearth
Approved-credit installs from $0 down, with a pre-qualification that takes about 60 seconds and no hidden APRs.
Rebates handled for you
SRP customers may qualify for up to $1,125 in Cool Cash on qualifying high-efficiency systems. We file the paperwork.
Why Choose RM III AC & Heating?
Honesty, expertise, and a commitment to exceeding your expectations every time.
Same-Day
Service Available
27 Yrs
Experience
5.0
HomeAdvisor Rating