# RM III A/C & Heating

> Family-owned, third-generation HVAC company serving Laveen Village and the Greater Phoenix West Valley, Arizona. Same-day air conditioning and heating repair, replacement, heat pumps, ductless mini-splits, smart thermostats, and indoor air quality. Owner Raul Mori is a third-generation technician with 27 years of experience. Licensed AZ ROC #332513. BBB Accredited (A+, since 2021). HomeAdvisor 5.0. Tagline: "Excellence with Integrity." Phone: (602) 290-7911.

## Main
- [Home](https://rmiiiaz.com/): Same-day AC & heating service across Metro Phoenix from an owner-operated, third-generation HVAC company.
- [About RM III A/C & Heating](https://rmiiiaz.com/about): The real story — family-owned, founded around 2020, led by third-generation tech Raul Mori with 27 years of experience.
- [Contact](https://rmiiiaz.com/contact): Request service, a free estimate, or a free second opinion. Serving Laveen Village and the Phoenix West Valley.
- [Free 2nd Opinion](https://rmiiiaz.com/free-second-opinion): Already have a quote from another company? We review any AC, heating, or air-quality quote free — no obligation, no pressure.

## Services
- [All Services](https://rmiiiaz.com/services): Residential and light-commercial HVAC and indoor air quality across the Phoenix West Valley.
- [AC Repair & Replacement](https://rmiiiaz.com/services/ac-repair-replacement): Diagnostics, fast repairs, and full system replacements for every major brand.
- [Heating & Furnace Service](https://rmiiiaz.com/services/heating-furnace-service): Furnace tune-ups, ignition fixes, and full heating replacements.
- [Heat Pumps](https://rmiiiaz.com/services/heat-pumps): High-efficiency heat-pump installs, retrofits, and service — eligible for SRP and federal incentives.
- [Ductless Mini-Splits](https://rmiiiaz.com/services/ductless-mini-splits): Zoned comfort for additions, casitas, and hard-to-cool rooms.
- [Indoor Air Quality](https://rmiiiaz.com/services/indoor-air-quality): HEPA filtration, UV germicidal lights, and whole-home air purifiers built for Phoenix dust.
- [Smart Thermostats](https://rmiiiaz.com/services/smart-thermostats): Install, integrate, and program smart thermostats for real savings.
- [Maintenance Plans](https://rmiiiaz.com/services/maintenance-plans): Seasonal tune-ups that catch the failure before the heat wave does.

## Service Areas
- [All Service Areas](https://rmiiiaz.com/service-areas): RM III serves 30 metro-Phoenix cities from its Laveen Village base, across the West, Central, North, East, and Southeast Valleys. Includes a "do we serve your ZIP?" coverage checker. Cities: Laveen Village, Phoenix, Scottsdale, Tempe, Mesa, Chandler, Gilbert, Queen Creek, Apache Junction, Fountain Hills, Paradise Valley, Cave Creek, Carefree, Anthem, Glendale, Peoria, Surprise, El Mirage, Sun City, Sun City West, Youngtown, Avondale, Goodyear, Litchfield Park, Tolleson, Buckeye, Maricopa, San Tan Valley, Sun Lakes, and Gold Canyon.
- [Laveen Village](https://rmiiiaz.com/service-areas/laveen-village): Our home base — local, owner-operated HVAC service in the 85339 corridor below South Mountain.
- [Phoenix](https://rmiiiaz.com/service-areas/phoenix): AC and heating service across Phoenix, from historic central districts to Ahwatukee — including older systems past their failure window.
- [Glendale](https://rmiiiaz.com/service-areas/glendale): AC, heating, and indoor-air-quality service across Glendale, from historic Catlin Court to two-story Arrowhead Ranch homes.
- [Goodyear](https://rmiiiaz.com/service-areas/goodyear): HVAC service and replacement for the fast-growing West Valley — Estrella, PebbleCreek, and Palm Valley.
- [Avondale](https://rmiiiaz.com/service-areas/avondale): Same-day AC repair and honest repair-or-replace guidance across Avondale, one of our closest neighbors.
- [Tolleson](https://rmiiiaz.com/service-areas/tolleson): Local heating and cooling for Tolleson homes and businesses — 10–15 minutes from our shop.
- [Buckeye](https://rmiiiaz.com/service-areas/buckeye): Our westernmost regular run — AC and heating for Buckeye's fast-growing, mostly new-build communities.
- [Surprise](https://rmiiiaz.com/service-areas/surprise): Northwest Valley AC and heating, from Sun City Grand's active-adult homes to Marley Park.
- [Peoria](https://rmiiiaz.com/service-areas/peoria): AC and heating across Peoria, from Old Town's established homes to the newer Vistancia foothills.
- [Mesa](https://rmiiiaz.com/service-areas/mesa): East Valley AC and heating, from mid-century West Mesa to the new-build Eastmark community.
- [Tempe](https://rmiiiaz.com/service-areas/tempe): AC and heating for Tempe's mid-century homes, rentals, and ASU-area properties.
- [Chandler](https://rmiiiaz.com/service-areas/chandler): Southeast Valley AC and heating, from Ocotillo's lake communities to the tech corridor.
- [Gilbert](https://rmiiiaz.com/service-areas/gilbert): AC and heating for Gilbert — one of the newest, most master-planned communities we serve.
- [Scottsdale](https://rmiiiaz.com/service-areas/scottsdale): AC and heating across Scottsdale, from south Scottsdale's ranch homes to the north desert foothills.

## Resources
- [Financing & Rebates](https://rmiiiaz.com/financing): Hearth financing ($0 down on approved credit), price-match, free estimates, and SRP Cool Cash rebate filing handled for you.
- [Promotions](https://rmiiiaz.com/promotions): Current offers — free estimates, price-match, and senior & military discounts.
- [Reviews](https://rmiiiaz.com/reviews): HomeAdvisor 5.0 and BBB A+ — see what Phoenix homeowners say about RM III.
- [FAQs](https://rmiiiaz.com/faq): Answers on licensing, service areas, rebates, and what to expect.
- [Blog](https://rmiiiaz.com/blog): HVAC tips and guidance for the Phoenix climate.
- [Learning Center](https://rmiiiaz.com/learning-center): Plain-language HVAC guides — AC costs, troubleshooting, rebates, sizing, and hiring a trustworthy contractor.
- [HVAC Glossary](https://rmiiiaz.com/learning-center/glossary): Desert-HVAC terms defined in plain English.
- [Careers](https://rmiiiaz.com/careers): Join an owner-operated team that values honest work.

## Blog
- [5 Signs Your AC Needs Service Before a Phoenix Summer](https://rmiiiaz.com/blog/5-signs-you-need-service): Five warning signs a Phoenix AC needs service before the first 115° day — weak cooling, short-cycling, odd noises, musty air, and rising bills.
- [How Often Should You Service Your AC in Phoenix?](https://rmiiiaz.com/blog/how-often-schedule-maintenance): How often a Phoenix AC really needs service — once a year minimum, often twice for desert run-hours — what each visit covers, and what skipping it costs.
- [Comparing HVAC System Options: A Phoenix Buyer's Guide](https://rmiiiaz.com/blog/comparing-system-options): How to compare HVAC system options for a Phoenix home — sizing, SEER2 efficiency, system type, and total cost after rebates.
- [Common AC Problems in Phoenix (and How to Troubleshoot Them)](https://rmiiiaz.com/blog/common-issues-troubleshooting): The most common Phoenix AC problems — warm air, weak cooling, freezing, constant running — the safe checks to try, and when to call a pro.

## Learning Center
- [Phoenix HVAC Learning Center](https://rmiiiaz.com/learning-center): 57 plain-language HVAC guides for Metro Phoenix homeowners across ten categories — heating & cooling, heat pumps & mini-splits, air quality & dust, equipment & efficiency, maintenance & seasonal, evaluate & compare, cost guides, brands we install & service, comfort by space, and tools & references.
- [HVAC Glossary](https://rmiiiaz.com/learning-center/glossary): 32 desert-HVAC terms defined in plain English — SEER2, Manual J, Manual D, zoning, inverter compressors, MERV, SRP Cool Cash, and more.

### Heating & Cooling
- [How Does a Heat Pump Work? (Plain English)](https://rmiiiaz.com/learning-center/how-a-heat-pump-works): A heat pump doesn't burn fuel or glow like a heat strip — it moves heat that already exists from one place to another. Here's the plain-English version, and why it suits the Phoenix climate.
- [Why Is My Heat Blowing Cold Air?](https://rmiiiaz.com/learning-center/furnace-blowing-cold-air): Cold air from your heating vents usually isn't a dead furnace — it's often a thermostat setting, a safety shutoff, or a heat pump doing exactly what it should. Here's how to tell which.
- [How Your AC Actually Works When It's 115°F](https://rmiiiaz.com/learning-center/how-ac-works-in-extreme-heat): Your AC doesn't make cold — it moves heat out of your house. On a 115° day that's an enormous job, and knowing the limits tells you what's normal versus a real problem.
- [Why Is My AC Blowing Warm Air at 115°F?](https://rmiiiaz.com/learning-center/ac-blowing-warm-air): AC blowing warm air when it's 115° outside? Start with three safe checks, understand the common causes, and know when it's time to call a licensed technician.
- [My AC Runs But Won't Cool Below 80°F — Why?](https://rmiiiaz.com/learning-center/ac-not-cooling-below-80): The AC runs constantly but the house is stuck at 80°+. Here's what causes it in the Phoenix heat, what's safe to check, and when it points to a bigger problem.
- [Why Is My AC Freezing Up in the Middle of Summer?](https://rmiiiaz.com/learning-center/ac-freezing-up-in-summer): Finding ice on your AC in the middle of a Phoenix summer feels backwards — here's why it happens, how to safely thaw it, and what a tech needs to fix.
- [Is It Bad That My AC Runs All Day in a Heat Wave?](https://rmiiiaz.com/learning-center/ac-running-all-day-heat-wave): An AC that runs almost nonstop in a 115° heat wave can be perfectly normal — or a warning sign. Here's how to tell the difference and lower the load.

### Heat Pumps & Mini-Splits
- [What Size AC Do You Need for a 2,000 Sq Ft Phoenix Home?](https://rmiiiaz.com/learning-center/what-size-ac-for-2000-sq-ft-home): A 2,000 sq ft Phoenix home often needs a system in the 3.5–5 ton range — but square footage alone never sizes an AC correctly. Here's how it's actually done.
- [Heat Pump vs. Traditional AC for a Phoenix Home](https://rmiiiaz.com/learning-center/heat-pump-vs-ac-phoenix): A heat pump cools just like an AC but also heats — and Phoenix's mild winters plus big federal incentives make it a serious contender. Here's the honest comparison.
- [Heat Pump Cost in Phoenix (2026)](https://rmiiiaz.com/learning-center/heat-pump-cost-phoenix): A quality heat pump in Phoenix often costs close to a comparable high-efficiency AC — and federal incentives can tip it cheaper. Here are honest ranges and the only number that's real.
- [Furnace vs. Heat Pump in Phoenix](https://rmiiiaz.com/learning-center/furnace-vs-heat-pump-phoenix): Phoenix barely has a winter, which changes the furnace-versus-heat-pump math. Here's when an all-electric heat pump wins, and when keeping a healthy gas furnace makes more sense.
- [Mini-Splits for Casitas, Additions & Garages](https://rmiiiaz.com/learning-center/mini-splits-for-casitas-additions): Ductless mini-splits are the go-to fix for casitas, additions, converted garages, sunrooms, and that one room your central AC never reaches. Here's how they work in Phoenix.
- [Mini-Split vs. Central AC for a Phoenix Home](https://rmiiiaz.com/learning-center/mini-split-vs-central-ac): Whole-home ducted central air or zoned ductless mini-splits? The honest answer depends on your ducts, your layout, and your budget. Here's how they compare in the Phoenix desert.

### Air Quality & Dust
- [UV Light vs. Air Purifier: What Does Your Phoenix Home Need?](https://rmiiiaz.com/learning-center/uv-light-vs-air-purifier): A UV light and an air purifier sound interchangeable, but they fix two different problems. Here's what each one actually does in a Phoenix home — and when you want both.
- [Do You Need a Whole-House Dehumidifier in Phoenix?](https://rmiiiaz.com/learning-center/whole-house-dehumidifier-phoenix): Dehumidifiers are standard in humid climates, but Phoenix is mostly dry. Here's the honest answer on whether your desert home actually needs one — and when it genuinely helps.
- [How to Improve Indoor Air Quality in the Desert](https://rmiiiaz.com/learning-center/improve-indoor-air-quality-desert): Clean desert air isn't one gadget — it's layers. Here's the honest, Phoenix-specific playbook for cutting dust and breathing easier, from the filter to the ductwork.
- [How to Reduce Dust in Your Home During Monsoon Season](https://rmiiiaz.com/learning-center/reduce-dust-monsoon-season): Monsoon haboobs push fine dust into Phoenix homes for weeks. Here's how your HVAC system can meaningfully cut the dust you breathe and clean off every surface.
- [The Best Air Filter for Arizona Dust](https://rmiiiaz.com/learning-center/best-air-filter-for-arizona-dust): Filter choice is a real trade-off in the desert: capture enough dust without choking airflow. Here's how to pick the right MERV for an Arizona home.

### Equipment & Efficiency
- [Best AC Brand for Phoenix Heat? (The Honest Answer)](https://rmiiiaz.com/learning-center/best-ac-brand-for-phoenix-heat): There's no single 'best brand' for the desert. What actually decides whether an AC survives the Phoenix heat is sizing, the install, and the parts behind it.
- [How Long Do AC Units Last in Arizona?](https://rmiiiaz.com/learning-center/how-long-do-ac-units-last-in-arizona): National lifespans don't apply in the desert. Here's the honest range for a Phoenix AC, why our heat shortens it, and what actually makes a system go the distance.
- [What SEER2 Rating Do You Need in Phoenix?](https://rmiiiaz.com/learning-center/what-seer2-rating-for-phoenix): SEER2, EER2, the Southwest minimum, and the rebate threshold — exactly what efficiency rating makes sense for an air conditioner in the Phoenix desert.
- [Is a Higher SEER2 Worth It in Phoenix?](https://rmiiiaz.com/learning-center/is-higher-seer2-worth-it-phoenix): Premium efficiency costs more up front. Here's an honest, desert-specific look at when a higher SEER2 actually pays for itself — and when 15.2 is the smart stop.

### Maintenance & Seasonal
- [What's Actually in a Real AC Tune-Up?](https://rmiiiaz.com/learning-center/whats-in-an-ac-tune-up): Not all tune-ups are equal. Here's the full checklist a thorough Phoenix AC tune-up should cover — and the corners a cheap 'inspection' quietly cuts.
- [The Phoenix Homeowner AC Maintenance Checklist](https://rmiiiaz.com/learning-center/ac-maintenance-checklist): You can handle a surprising amount of AC upkeep yourself. Here's the simple monthly and seasonal checklist for Phoenix homes — plus what to leave to a licensed pro.
- [How to Get Your AC Ready Before Phoenix Summer](https://rmiiiaz.com/learning-center/pre-summer-ac-prep): The best time to find an AC problem is before the first 110° day — not during it. Here's how to prep your system in the cool months and beat the spring rush.
- [Permits & AZ ROC Licensing for HVAC Work](https://rmiiiaz.com/learning-center/permits-and-az-roc-licensing): A replacement isn't just bolting in a new box. Here's why your changeout needs a permit, how to verify an Arizona contractor's license, and what cutting corners really costs.
- [When Is the Best Time for AC Maintenance in Phoenix?](https://rmiiiaz.com/learning-center/best-time-of-year-for-ac-maintenance): Timing your AC maintenance right means catching problems before the heat — not during it. Here's the ideal Phoenix maintenance calendar.
- [How to Find a Licensed, Trustworthy AC Company in Arizona](https://rmiiiaz.com/learning-center/how-to-find-a-licensed-hvac-contractor-arizona): Before you let anyone touch your AC, learn how to verify an Arizona contractor's license and insurance, read reviews critically, and spot the red flags.
- [Questions to Ask Before Hiring an HVAC Contractor in AZ](https://rmiiiaz.com/learning-center/questions-to-ask-before-hiring-hvac-contractor): Print this list before any in-home estimate. The right questions about licensing, sizing, the quote, and warranties separate the pros from the pressure sellers.

### Evaluate & Compare
- [Repair or Replace a 15-Year-Old AC in the Phoenix Heat?](https://rmiiiaz.com/learning-center/repair-or-replace-15-year-old-ac): When your 15-year-old AC quits in July, should you repair it or replace it? An honest, math-based framework built for the Phoenix climate — not a sales pitch.
- [Repair or Replace Your Furnace in Phoenix?](https://rmiiiaz.com/learning-center/repair-or-replace-furnace): Phoenix barely runs its furnace, so the repair-or-replace math isn't the same as for an AC. Here's the age-and-cost rule, the one safety red line, and the heat-pump option.
- [Window AC vs. Mini-Split vs. Central AC](https://rmiiiaz.com/learning-center/window-ac-vs-mini-split-vs-central): Three ways to cool a Phoenix space, and they solve different problems. Here's how window AC, ductless mini-splits, and central AC compare — and when each one wins.
- [Should I Get a Second Opinion on My AC Replacement Quote?](https://rmiiiaz.com/learning-center/should-i-get-a-second-opinion-on-ac-quote): A new AC is a major purchase. Here's when a free second opinion is worth it — and how an honest review can confirm a fair deal or save you from an expensive mistake.

### Cost Guides
- [Mini-Split Installation Cost in Phoenix (2026)](https://rmiiiaz.com/learning-center/mini-split-installation-cost-phoenix): Ballpark 2026 Phoenix prices for single-zone and multi-zone ductless mini-splits, what actually moves the number, and how a heat-pump mini-split may unlock incentives.
- [What Does an Indoor Air Quality System Cost in Phoenix?](https://rmiiiaz.com/learning-center/indoor-air-quality-system-cost): Air quality upgrades are priced by component, not as one number. Here are the ballpark tiers for filters, UV lights, purifiers, and dehumidifiers in the Phoenix desert.
- [Why AI (and Online Calculators) Can't Give You a Real HVAC Price](https://rmiiiaz.com/learning-center/why-ai-doesnt-know-your-price): A chatbot or online calculator can give you a ballpark, but it can't quote your job. Here's what a real Phoenix HVAC price actually depends on — and how to get an honest one.
- [How Much Does a New AC Cost in Phoenix in 2026?](https://rmiiiaz.com/learning-center/how-much-does-a-new-ac-cost-in-phoenix): A clear, no-pressure breakdown of 2026 Phoenix AC replacement prices — what drives them up or down, and how rebates and financing change your real number.
- [Whole-HVAC Replacement Cost in Arizona: A 2026 Guide](https://rmiiiaz.com/learning-center/hvac-replacement-cost-arizona): Replacing your whole heating and cooling system at once? Here's what a complete HVAC replacement costs in Arizona in 2026 and how to compare bids apples-to-apples.
- [How Much Does an AC Tune-Up Cost in Phoenix?](https://rmiiiaz.com/learning-center/ac-tune-up-cost-phoenix): What a Phoenix AC tune-up costs, what a thorough one actually includes, and how seasonal maintenance pays for itself before the first heat wave.
- [SRP Cool Cash: The 2026 AC Rebate Explained](https://rmiiiaz.com/learning-center/srp-cool-cash-rebate): How SRP's Cool Cash rebate works in 2026, who qualifies, how much you can get, and the SEER2 and deadline details that decide whether you're eligible.
- [Did APS End Its AC Rebate? Yes — Here's What's Left](https://rmiiiaz.com/learning-center/aps-hvac-rebate-ended): If you're an APS customer, the residential HVAC rebate ended on January 1, 2026. Here's what that means — and the real incentives you can still use.
- [Federal HVAC Rebates & Tax Credits in Arizona (2026)](https://rmiiiaz.com/learning-center/federal-hvac-rebates-tax-credits-arizona): Beyond your utility, two federal programs can cut the cost of a new system in 2026: the income-qualified HEAR / Efficiency Arizona rebate and the 25C tax credit.

### Brands We Install & Service
- [The HVAC Brands RM III Installs & Services](https://rmiiiaz.com/learning-center/hvac-brands-we-install-and-service): RM III installs and services every major residential HVAC brand in Phoenix. As an independent licensed contractor (not a manufacturer's dealer), it recommends what fits — because the installer matters more than the badge in our heat.
- [Carrier AC Systems in Phoenix](https://rmiiiaz.com/learning-center/carrier-ac-systems-phoenix): Carrier is a premium, widely available brand whose variable-speed Infinity systems suit long Phoenix run-hours. RM III installs and services Carrier, sizing first.
- [Trane AC Systems in Phoenix](https://rmiiiaz.com/learning-center/trane-ac-systems-phoenix): Trane is known for rugged, durable equipment built for heavy run-hours. RM III installs and services Trane — but the install still decides desert longevity.
- [Lennox AC Systems in Phoenix](https://rmiiiaz.com/learning-center/lennox-ac-systems-phoenix): Lennox makes some of the highest-efficiency systems available, with the trade-off of more proprietary parts. RM III installs and services Lennox.
- [Goodman AC Systems in Phoenix](https://rmiiiaz.com/learning-center/goodman-ac-systems-phoenix): Goodman is the value leader, with low-cost common parts and a strong warranty (owned by Daikin). On value equipment, the install matters most.
- [Mitsubishi Electric Ductless Systems in Phoenix](https://rmiiiaz.com/learning-center/mitsubishi-electric-ductless-phoenix): Mitsubishi Electric leads on ductless mini-splits and inverter heat pumps — ideal for Phoenix casitas, additions, garages, and zoning a single hot room.
- [Rheem AC Systems in Phoenix](https://rmiiiaz.com/learning-center/rheem-ac-systems-phoenix): Rheem delivers dependable mid-market value with EcoNet controls and widely available parts (sister brand Ruud). RM III installs and services Rheem.

### Comfort by Space
- [AC for Every Space in Your Phoenix Home](https://rmiiiaz.com/learning-center/ac-for-every-space-in-your-phoenix-home): Different spaces fail to cool for different reasons — and the fix is rarely a bigger AC. How RM III diagnoses airflow, ducts, zoning, and load for each hard-to-cool space.
- [Why Your Upstairs Bedroom Is Hot in Phoenix](https://rmiiiaz.com/learning-center/hot-upstairs-bedroom-phoenix): A hot upstairs is usually heat that rises, an attic baking the ceiling, and starved ducts — not a weak AC. The real fixes are zoning, duct repair, or a mini-split.
- [Cooling a Bonus Room Over the Garage](https://rmiiiaz.com/learning-center/bonus-room-over-garage-ac): A room over the garage bakes from the uninsulated garage below and long, starved duct runs. A ductless mini-split usually beats upsizing the central system.
- [Cooling a Garage or Workshop in Phoenix](https://rmiiiaz.com/learning-center/garage-workshop-cooling-phoenix): A Phoenix garage gains enormous heat and shouldn't be tied into your home's ducts. A right-sized mini-split plus insulation is the durable answer.
- [Cooling a Sunroom or Arizona Room in Phoenix](https://rmiiiaz.com/learning-center/sunroom-cooling-phoenix): A sunroom is a glass heat trap your central AC was never sized for. The honest fix is a right-sized ductless mini-split plus shading — not a stretched duct run.
- [Whole-Home Zoning for a Phoenix House](https://rmiiiaz.com/learning-center/whole-home-zoning-phoenix): One thermostat can't keep a two-story home even. Compare HVAC zoning, a multi-zone mini-split, and duct fixes — and when each solves the comfort gap.
- [New-Construction vs. Retrofit HVAC in Phoenix](https://rmiiiaz.com/learning-center/new-construction-vs-retrofit-hvac): Designing HVAC for a new build differs from retrofitting an older home. Compare load calcs, duct design, and zoning — and the honest trade-offs of each path.

## Company
- [Privacy Policy](https://rmiiiaz.com/privacy): How RM III A/C & Heating handles your information.
- [Terms of Service](https://rmiiiaz.com/terms): The terms governing use of this website.
- [Accessibility Statement](https://rmiiiaz.com/accessibility): Our commitment to WCAG 2.2 AA accessibility.