Air Conditioning Advice

In-depth guides from the techs who install and repair AC systems across the Phoenix Valley every day.

3 articles — updated for Phoenix homeowners

Troubleshooting14 min readAugust 1, 2026

Why Is My AC Running But Not Cooling? 12 Causes and How to Fix Each One

Your AC is running — the fan is spinning, the compressor is humming — but the air coming out of the vents is warm or barely cool. Here are the 12 most common causes, ranked from easiest to fix yourself to most serious.

Why this happens more in Phoenix than anywhere elseThe thermostat is set to 'Fan Only' or 'On' instead of 'Cool' and 'Auto'Dead or weak thermostat batteries+11 more sections

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Buying Advice16 min readAugust 8, 2026

Repair or Replace Your AC? A Phoenix Homeowner's Complete Decision Guide

This is the most important financial decision you'll make about your home's AC system. Get it wrong and you either spend thousands on a repair that fails again in a year, or replace a system that had years of good service left. Here's exactly how to think through it.

Why this decision is harder in Phoenix than elsewhereThe age ruleThe $5,000 rule — the most practical decision framework+6 more sections

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Installation13 min readAugust 15, 2026

How to Size an AC System for a Phoenix Home: The Complete Guide

Incorrect AC sizing is more common than most homeowners realize — and it's the root cause of systems that run constantly, houses that never feel comfortable, and equipment that wears out years early. Here's everything you need to know.

Why sizing is the most important installation decisionThe consequences of an oversized systemThe consequences of an undersized system+6 more sections

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