Our Work Map: 3,321 Real HVAC Jobs Across Central OK
I mapped 3,321 real Hartzell’s jobs and 1,894 customer locations across Central Oklahoma. Filter by ZIP, see photos and reviews. Call 405-375-4822.
5 Signs Your Oklahoma AC Is About to Die Memorial Day
Memorial Day weekend pushes Oklahoma ACs into their first 90 degree stretch, and weak systems fail in the first 72 hours. Here are the 5 signs I watch for every spring after 47 years of HVAC work in Kingfisher.
Allergy Season in Central Oklahoma: What 47 Years Taught Me About Your Air Handler and Indoor Air Quality
Why Oklahoma allergies hit so hard in May, and what 47 years of HVAC work taught me about MERV filters, UV lights, duct sealing, and your air handler.
Why Your AC Worked Last Week But Won’t Cool Today: First-Hot-Day Failure Guide for Central Oklahoma (May 2026)
AC not cooling Oklahoma on the first hot day? Master HVAC tech in Kingfisher explains 8 common May failures. 4.8 stars, 300+ Google reviews. Call 405-375-4822.
AC Tune-Up in Kingfisher Oklahoma: My PMA Plan
What a real $229 AC tune-up in Kingfisher Oklahoma includes: 12-point check from a Master HVAC tech with 47 years on the truck. Book before the 90s hit.
I’m in Marquis Who’s Who. Here’s What That Means.
Marquis Who’s Who picked me for their 2026 edition. After 47 years in HVAC and 15+ years running my own shop in Kingfisher, here’s what it actually changes for the people I work for. Spoiler: not much, and that’s the point.
What Oklahoma Homeowners Actually Expect From Geothermal (And Where Reality Bites Back)
Master HVAC Dave Hartzell breaks down the April 2025 ACHR geothermal survey for Kingfisher Oklahoma homeowners. Cost, rebates, lifespan, install. Call 405-375-4822.
Window AC Not Cooling? What to Check First
15+ years • 6,500+ jobs completed • 1,500+ Oklahoma homes served Why is my window AC not cooling properly? A
Heat Pump Airflow Problems in Oklahoma
15+ years • 6,500+ jobs completed • 1,500+ Oklahoma homes served Why does my heat pump have weak airflow? Weak
High-Efficiency Heat Pump vs Standard: Worth It?
15+ years • 6,500+ jobs completed • 1,500+ Oklahoma homes served Is a high-efficiency heat pump worth it over a