Author name: Dave Hartzell

Water heater not working in Oklahoma? Learn when to repair vs. replace, the 10-year rule, common problems, and what Hartzell’s installs. Kingfisher OK, 405-375-4822.

Ductless mini-split not cooling or heating in Oklahoma? Dirty filter, low refrigerant, drain blockage, or a communication fault are the most common causes. Hartzell’s Heat & Air, Kingfisher OK. 405-375-4822.

Geothermal heat pump problems in Oklahoma, what goes wrong with ground loops, refrigerant circuits, and controls. Hartzell’s is IGSHPA Accredited and ClimateMaster GeoElite certified. 405-375-4822.

Heat pump not heating or cooling in Oklahoma? The most common causes are dirty filter, low refrigerant, defrost board failure, or a stuck reversing valve. Hartzell’s Heat & Air, Kingfisher OK. 405-375-4822.

February is Oklahoma’s slowest HVAC month, faster scheduling, better availability & off-season pricing. Here’s why now is the smart time to book.

Oklahoma HVAC systems face extreme heat, cold snaps & dust. Here’s how long each system lasts, the warning signs & how to make the repair-vs-replace call.

Furnace running but not heating? Walk through the most common Oklahoma causes, dirty filters, tripped limits, failed igniters, and what you can fix yourself.

2026 heat pump installation cost guide for central Oklahoma, single-stage to variable-speed, dual-fuel & Hyper-Heat options compared.