These HVAC tips are written for homes in Fallbrook and the rest of North County, where summers are hot inland, winters are mild, SDG&E sets the electric rates and permits come from either San Diego County or your city. Each guide answers the question first, then explains the details, and lists its sources. Rules and rebates change, so every guide shows when it was last checked.
Looking for a quick answer instead? Try our HVAC FAQ.
New to HVAC terms? Our HVAC glossary explains SEER2, AFUE, MERV and more in plain English.
Costs and buying
AC replacement cost in North County
Published price ranges for San Diego, and what actually moves the number.
Furnace replacement cost
Published San Diego ranges and what moves the price.
Heat pump cost in San Diego
What drives the price, and the honest 2026 rebate picture.
What size AC do I need?
Why a load calculation beats square-foot rules of thumb.
Repair or replace calculator
Six questions, a straight answer and the reasons behind it.
Repair or replace your AC?
How age, repair type and refrigerant should shape the decision.
Heat pump vs furnace
Which makes sense with mild winters, SDG&E rates and gas or propane.
How long HVAC systems last
Coastal salt air versus inland heat, and how to get more years.
Rules and rebates
Title 24 and HVAC permits
When you need a permit in San Diego County, and what the duct test involves.
SEER2 requirements in California
The minimum efficiency ratings for new ACs and heat pumps, explained.
R-410A phase-out and R-454B
What the refrigerant change means for repairs and new systems in 2026.
Thermostat settings for SDG&E time-of-use
Pre-cooling, setbacks and the 4–9 pm on-peak window.
SDG&E rebates and tax credits
Which programs are open or closed right now.
Troubleshooting
HVAC troubleshooter
Tap your symptom and get the likely cause, safe checks and when to call.
AC frozen or ice on the lines
Why it happens, how to thaw it safely, and when to call.
AC short-cycling
Why your AC keeps turning on and off.
AC leaking water inside
Drain lines, pans and float switches, plus what to check first.
Heat pump not heating
Defrost cycles, settings and real faults.
Furnace not working?
Safe checks to try first, and when to stop and call.
Common HVAC problems in Fallbrook
AC running but not cooling, frozen coils, leaks and odd noises.
Maintenance and air quality
10 HVAC maintenance tips
Simple jobs that keep your system efficient between service visits.
Heat wave cooling tips
Keep your home cool and your AC running in a North County heat wave.
Santa Ana winds and your HVAC
Dust, debris, power shutoffs and filtration.
Wildfire smoke and indoor air
How to use your HVAC system and filters to keep smoke out.
When a guide isn't enough, our technicians can take a look. Book a yearly tune-up, or contact us with a question.