About Us

Welcome to HVAC Routine (hvacroutine.com), an authoritative resource designed to help homeowners, DIY mechanics, and technicians troubleshoot, repair, and maintain heating, ventilation, air conditioning, and cooling systems.

Our Mission

Modern cooling and heating equipment relies heavily on complex electrical circuits, microcontrollers, and sealed refrigeration lines. When an error code pops up or an air conditioner stops cooling, finding practical, step-by-step guidance can be challenging.
Our goal is to break down technical HVAC problems into clear, actionable, and safety-focused guides. Every article published on this platform is structured to help you diagnose faults accurately, test components with proper tools, and perform routine maintenance before calling a technician.

Meet the Founder & Technical Lead

MD Thouhidul Islam | HVAC/R Specialist & Electrical Technician
HVAC Routine was founded by MD Thouhidul Islam, an electrical specialist with a formal Diploma in Electrical Engineering and a professional certification in Air Conditioning and Refrigeration.
With over three years of hands-on field experience troubleshooting residential and commercial cooling units, Thouhidul specializes in:
  • Electrical circuit diagnostics and wiring diagram interpretations.
  • Component-level testing (capacitors, contactors, compressors, and thermistors).
  • Brand-specific digital error code resolution (LG, Daikin, Gree, Carrier, Samsung).
  • Preventive maintenance, coil cleaning, and system performance tuning.
Every guide on HVAC Routine combines theoretical engineering principles with real-world field experience to ensure technical accuracy and safety.

What We Cover

  • HVAC Maintenance: Preventive care checklists, air filter replacements, coil washing, and seasonal system tune-ups.
  • AC & Equipment Error Codes: Direct diagnostic steps for display fault codes and flashing indicator lights.
  • Appliance & System Troubleshooting: In-depth technical guides for diagnosing compressor failures, electrical shorts, refrigerant leaks, and thermostat connection issues.

Technical Accuracy & Safety Commitment

HVAC systems run on high voltage and pressurized refrigerants. Safety is our top priority. Our content strictly emphasizes proper electrical isolation, safety gear, and accurate multimeter testing methods. If a repair involves hazardous procedures, we explicitly advise when it is time to contact a licensed professional.