Where is the most common place for a Freon leak?

The most common refrigerant leak points are the evaporator coil, the condenser coil, and the connections along the line set. Corrosion and vibration cause most leaks. The most frequent leak locations include: - **Evaporator coil (indoor)**: Pinhole leaks from corrosion, especially in coastal or high-humidity conditions, and from age. Often hidden inside the air handler or furnace cabinet ($1,000-$2,500+ to repair or replace the coil) - **Condenser coil (outdoor)**: Damage from hail, debris, dust buildup, or vibration; the repair cost depends on the extent of the damage - **Flare and brazed line set connections**: Loose or cracked fittings where copper lines meet the indoor and outdoor units - **Service valves and Schrader ports**: Worn valve cores or cracked caps that slowly seep refrigerant

How do I know if my AC drain is clogged?

Common signs include water pooling around the indoor air handler or furnace, a musty smell, the AC shutting off unexpectedly, or a float switch that has tripped. In Arizona, a clogged condensate line is less common than in humid states, but it still happens, especially during monsoon season when dust and debris get into the system. If you see water near your air handler, turn the system off and call a licensed HVAC technician. The most common warning signs include: - **Water pooling** around the indoor unit, attic air handler, or closet - **Musty or mildew odor** coming from vents - **System shuts off** unexpectedly, often due to a tripped safety float switch - **Water stains** on ceilings or walls near the air handler - **Standing water** in the drain pan or at the condensate line exit

What causes an AC unit to leak?

AC leaks usually come from refrigerant line damage, corroded or cracked coil joints, failed service valves, or condensate drain problems. Refrigerant leaks are the most serious and require professional repair under EPA Section 608 rules. The most common causes include: - **Corrosion** — Acidic buildup and Arizona's mineral-heavy conditions can eat through copper coils and line sets - **Vibration damage** — Constant cycling loosens fittings and cracks joints over time - **Physical damage** — Debris, lawn equipment, or hail can puncture lines or coils - **Worn seals and Schrader valves** — Aging valve cores and O-rings slowly lose refrigerant - **Condensate line clogs** — Algae and debris cause water to overflow and leak from the indoor unit

What is the best way to find a leak in my AC system?

The most reliable method is a professional leak detection service using electronic leak detectors, UV dye, and pressure testing, typically performed by an ROC-licensed C-39 or R-39 contractor. For a basic check, you can inspect visible lines and fittings for oil residue, but locating refrigerant leaks accurately requires specialized tools. The main detection methods are: 1. **Electronic leak detector** — Sensitive sniffer that detects refrigerant near leak points 2. **UV dye test** — Fluorescent dye added to the system, located with a UV light 3. **Nitrogen pressure test** — Pressurizes the system to find leaks by pressure drop 4. **Soap bubble test** — Applied to joints and fittings for accessible leaks (low cost, DIY-friendly)

Is water dripping from AC harmful?

Usually not immediately, but it can cause damage if ignored. Dripping water often signals a clogged condensate drain, and overflow can cause water damage to ceilings, flooring, drywall, and the air handler. Standing water also encourages mold and can trigger float switch shutoffs that stop the system. Key risks include: - **Water damage** to ceilings, walls, and flooring near the indoor unit - **Mold and mildew** growth in the drain pan and ductwork - **System shutdown** from a float switch or safety switch - **Reduced efficiency** if the evaporator coil is icing up or the problem is refrigerant-related

Can you stay in a house with a refrigerant leak?

In most cases, yes, you can stay in a home with a refrigerant leak, but you should ventilate the space and avoid direct contact with the leaking refrigerant. Modern residential systems in Arizona typically use R-410A, which is nonflammable and has low toxicity at normal exposure levels. Leave the home and call a licensed technician right away if you notice a strong chemical odor, frost or ice on refrigerant lines, dizziness, headaches, or breathing difficulty, especially in a closed space with pets or children.

Can I still run my AC if it's leaking?

You can run a leaking AC for a short time, but it is not recommended. Low refrigerant reduces cooling and can cause the evaporator coil to freeze, which may damage the compressor. A low-charge system also works harder, raising your energy bills. In Phoenix heat, schedule leak detection as soon as possible. If you see ice on the refrigerant lines or indoor coil, turn the system off and let it thaw before calling a technician.

AC Replacement and Installation

A New AC Built for 113-Degree Days

Phoenix cooling runs for months, and a poorly matched system pays for it every summer. Replacement done right starts with a calculation, not a guess.

Sized by load calculation, not habit
Permit and license checked before you sign
Written contract with real dates

Common problems

Signs It Is Time to Replace Your Phoenix AC

Phoenix logged 113 straight days at or above 100 degrees in 2024. Equipment in Phoenix, Mesa and Gilbert works hard for months, so wear shows up in plain ways.

Repeat breakdowns, one repair after another
Weak cooling on the hottest afternoons
Bills climbing with no change in how you use the AC
Rooms that never match the thermostat
New grinding, rattling or humming

Waiting costs more over time. Repairs stack up and bills keep rising. Then a failure in peak heat leaves you choosing equipment in a hurry.

Sound familiar? Your AC needed a repair last summer. You paid for it. This summer it needed another, and the house still sits warm by 4 p.m.

Is your weathered AC unit ready for a professional replacement

Repair or replace?

Age and refrigerant type both shape the decision. Our guide on repairing or replacing your AC in Phoenix walks through how to weigh them.

For newer refrigerant, see R-454B explained.

What it costs

What AC Replacement Costs in Phoenix: Summary

Price is driven by equipment, tonnage, ductwork condition, permit and labor. Larger systems and damaged ducts push the total up. For the full breakdown, read what AC replacement costs in Phoenix, and see the tonnage and pricing guide for sizing-related differences.

Price factors

What moves the price

Equipment
The unit you choose sets the base price
Tonnage
Larger systems cost more
Ductwork condition
Damaged ducts push the total up
Permit
Listed as its own line on an itemized quote
Labor
Installation labor adds to the equipment cost

The figures below come from Phoenix-area HVAC companies' own websites, checked October 2026. "Entry price" means a starting figure, not a typical total.

Job	Price printed on company sites
Complete HVAC system	$1,999 (entry price)
AC installation	From $4500 (entry price)
Standard central AC replacement	$7,000 to $12,000
Heat pump replacement	$6,000 to $12,000
Ductwork repairs or changes	Depends on the job

For a national point of comparison, Angi puts the average cost to install a new AC unit between $3,900 and $8,000, with labor around $1,500 alone.^[1] Phoenix prices run differently, so use that as context only.

Pro tip

Ask each company to price the same scope, with equipment, labor, permit and duct work listed separately, so the quotes compare fairly.

602 HVAC

Get an itemized written quote that separates equipment, labor, permit and any duct work.

What to expect

The Replacement Process, Step by Step

Most jobs in Scottsdale, Chandler or Tempe follow the same path.

Step by step

The replacement at a glance

Assessment
An in-home visit and load calculation size the system.
Quote
Equipment, labor, ducts and permit are itemized.
Contract
License number and start and completion dates are listed.
Permit check
Confirm who pulls the permit for your city.
Removal
The old system comes out and refrigerant is handled properly.
Installation
The new system goes in with condensate piping suited to the heat.
Startup test
The system must hold set indoor temperatures.
Walkthrough
Thermostat, filter and warranty paperwork are reviewed.

In-home assessment and load calculation. Sizing is calculated, not guessed, and oversizing is a real risk. See the tonnage guide.
Written quote. Equipment, labor, ducts and permit itemized.
Contract. It should carry the license number and start and completion dates.
Permit check. Rules differ by city, so confirm who pulls it.
Removal. The old system comes out and refrigerant is handled properly.
Installation. Rooftop condensate piping must suit the heat. Phoenix amendments bar nonmetallic piping in direct sun.
Startup test. Phoenix code requires systems able to hold set indoor temperatures.
Walkthrough. Thermostat, filter, warranty paperwork.

Spring, before the May-June rush, tends to be easier for scheduling than mid-summer.

Expertly installed new air conditioning unit for maximum home comfort

Choosing a company

How to Verify an Arizona ROC License

Arizona's Registrar of Contractors licenses HVAC contractors. Cities handle permits, not trade licenses. See Arizona ROC HVAC license basics.

HVAC work needs an R-39, R-39R or CR-39 type license. C-39 and C-58 are commercial classes.

Before you sign:

Search the ROC Contractor Search at roc.az.gov
Confirm the license is active and its class covers your contract
Make checks payable to the company named on the license
Ask for proof of insurance, since a license does not prove coverage beyond workers' compensation
Ask which permit rule applies in Phoenix, Mesa or Scottsdale; see the permit guide
Check rebate steps before installing: SRP and APS

Optional credentials include NATE, ACCA and EPA 608; see what they mean.

Red flags: no license number on the quote, pressure to sign the same day, or a vague "we'll figure out the size."

Checklist

Questions to ask before you sign

0 of 8 ticked

Is the license active on the ROC Contractor Search?
Does the license class (R-39, R-39R or CR-39) cover my contract?
Is the license number on the quote?
Is the check payable to the company named on the license?
Can you show proof of insurance?
Which permit rule applies in my city?
What rebate steps come before installation?
How will you size the system?

Tick them off as you go. Nothing is saved or sent.

Compare the licensed Phoenix-area pros below.

Questions Valley homeowners ask

Installing a new central air conditioning system in a Phoenix-area home depends on system size and efficiency, and larger homes or high-efficiency units cost more. Get a written quote from a licensed contractor. Costs depend on system size, SEER2 rating, ductwork condition, and whether a new air handler or furnace is needed. SRP and APS rebates can reduce the final cost for qualifying high-efficiency equipment.

System Size	Typical Home Size	Installed Cost (Phoenix)
2 ton	1,000-1,400 sq ft	Get a written quote
3 ton	1,500-2,000 sq ft	Get a written quote
4 ton	2,200-2,800 sq ft	Get a written quote
5 ton	3,000-3,500 sq ft	Get a written quote
Mini-split (single zone)	Add-on or single room	Get a written quote

Angi. "AC and Furnace Replacement Cost [2025 Data]." https://www.angi.com/articles/save-money-replacing-heat-ac-same-time.htm?entry_point_id=33797117. Accessed October 16, 2026.

AC Replacement and Installation

Common problems

Signs It Is Time to Replace Your Phoenix AC

Repair or replace?

What it costs

What AC Replacement Costs in Phoenix: Summary

What to expect

The Replacement Process, Step by Step

Choosing a company

How to Verify an Arizona ROC License

Questions Valley homeowners ask

Top-graded for ac replacement and installation

Salt River Air

Ellsworth Air and Plumbing

Sorensen Heating and Cooling

Read next

Tell us what your system is doing

AC Replacement and Installation

Common problems

Signs It Is Time to Replace Your Phoenix AC

Repair or replace?

What it costs

What AC Replacement Costs in Phoenix: Summary

What to expect

The Replacement Process, Step by Step

Choosing a company

How to Verify an Arizona ROC License

Questions Valley homeowners ask

How much to install an air conditioning unit in a house?

Where is the most common place for a Freon leak?

How do I know if my AC drain is clogged?

What causes an AC unit to leak?

What is the best way to find a leak in my AC system?

Is water dripping from AC harmful?

Can you stay in a house with a refrigerant leak?

Can I still run my AC if it's leaking?

Top-graded for ac replacement and installation

Salt River Air

Ellsworth Air and Plumbing

Sorensen Heating and Cooling

Read next

Tell us what your system is doing