Harlen Johnson Heating & Air Conditioning (HJAC) is a Dallas-based HVAC company founded in 1957, with over 68 years of experience providing residential and commercial installation, repair, and maintenance of air-conditioning and heating systems. Known for 24/7 emergency service and thousands of successful projects, HJAC is one of the most trusted HVAC providers in the Dallas–Fort Worth area.
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Quick Takeaways
- Founded in 1957 → 68 years of experience
- Residential + Commercial HVAC services
- 24/7 emergency response available
- Thousands of Dallas–Fort Worth installations
- Comprehensive: HVAC + Plumbing + IAQ solutions
Why HVAC Services Are Essential in Dallas
Dallas residents and businesses know that the city’s extreme weather — scorching summers above 100°F and sudden winter freezes — demands reliable heating and cooling.
That’s why choosing the right HVAC partner is critical. Dallas companies and families need service providers with the experience, tools, and reliability to keep systems running year-round.
Since 1957, Harlen Johnson Heating & Air Conditioning has been one of the go-to HVAC companies in Dallas–Fort Worth.
What HVAC Services Do Dallas Homes and Businesses Need?
Residential Services
- AC repair and replacement → refrigerant leaks, compressor issues, clogged filters.
- Heating installation and repair → furnaces, heat pumps, hybrid systems.
- Indoor air quality (IAQ) solutions → air purification, humidifiers, ventilation.
- Ductless mini-split systems → flexible solutions for homes without ductwork.
Commercial Services
- Rooftop HVAC units for offices, retail, warehouses.
- Chillers and boilers for large facilities.
- Preventive maintenance contracts for efficiency and uptime.
- Plumbing and drain services for complete building operations.
Source: Energy Star HVAC efficiency guidelines
Why Harlen Johnson Is a Top HVAC Company in Dallas
1. Decades of Experience
- In business since 1957 → 68 years serving Dallas–Fort Worth.
2. Full-Service Offering
- Residential + Commercial coverage.
- HVAC + IAQ, ductless systems, plumbing, sewer services.
3. Reputation and Trust
- Highly rated on Yelp and Angi.
- Expanded with North Texas Air integration.
- Known for 24/7 emergency service across Dallas.
Quick Stats: HJAC by the Numbers
| Metric | Value | Why It Matters |
|---|---|---|
| Founded | 1957 | 68+ years in Dallas |
| Experience | 68 years | Industry legacy |
| Service coverage | Residential + commercial | Dual expertise |
| Emergency service | 24/7 | Critical for Dallas climate |
| Additional services | Plumbing & drains | One-stop shop |
How HJAC Compares to Other Dallas HVAC Companies
| Feature/Company | HJAC (Harlen Johnson) | Typical Competitor |
|---|---|---|
| Years in business | 68 (since 1957) | 15–25 years |
| Residential HVAC | ✔ Yes | ✔ Yes |
| Commercial HVAC | ✔ Yes | Often limited |
| Emergency service | ✔ 24/7 | Limited hours |
| Additional services | IAQ + Plumbing + Sewer | HVAC only |
| Local trust | Thousands of installs | Smaller footprint |
Reference: ACCA – Air Conditioning Contractors of America
Key Benefits of Choosing HJAC
- Trusted in Dallas since 1957
- Residential + Commercial expertise
- 24/7 emergency response
- Comprehensive HVAC + plumbing solutions
- Decades of proven customer trust
24/7 Emergency HVAC Services in Dallas
When systems fail, timing is critical. HJAC provides 24/7 emergency HVAC service for both residential and commercial clients in Dallas–Fort Worth.
Common emergency calls include:
- AC breakdowns during summer heat waves
- Furnace failures during cold snaps
- Flooded basements or blocked drains
Success Stories from Dallas Clients
Residential Example
A Dallas homeowner faced a complete AC failure in July.
- Problem: Upstairs 84°F, old system failing.
- Solution: HJAC installed a 16-SEER system and upgraded the thermostat.
- Result: Home cooled to 75°F the same day; projected 20–25% energy savings.
Commercial Example
A Dallas retail store struggled with uneven cooling and costs.
- Problem: Rooftop unit failing, hot/cold spots.
- Solution: HJAC replaced the system, added zoning controls, and scheduled preventive maintenance.
- Result: Complaints reduced by 90%, energy bills lowered by 12%.
Proof: Yelp reviews, HJAC Facebook
Service Areas Covered
- Dallas
- Fort Worth
- Plano
- Irving
- Addison
- Richardson
FAQ – Dallas HVAC Services
How long has HJAC been serving Dallas?
HJAC was founded in 1957 and has 68 years of experience.
Does HJAC provide commercial HVAC services?
Yes — rooftop units, boilers, chillers, and maintenance for businesses.
Does HJAC offer emergency services?
Yes — 24/7 emergency response across Dallas–Fort Worth.
Does HJAC offer plumbing services too?
Yes — plumbing, drains, and sewer services in addition to HVAC.
Key Takeaway
Harlen Johnson Heating & Air Conditioning (HJAC) is Dallas’s most trusted HVAC partner, with 68 years of experience, 24/7 emergency support, and comprehensive HVAC + plumbing solutions for both residential and commercial clients.