Learning Center / Harold Brothers Blog / Dennis Allen

Dennis Allen

Dennis Allen is the COO and Director of HVAC at Harold Brothers Mechanical. With over 20 years in the trade, he leads the HVAC division and mentors the next generation of technicians. A board member for the Massachusetts Pipefitters and Refrigeration Board, Dennis is passionate about education, field excellence, and emerging technologies like VRF systems.

Why Is Reheat Running in Your HVAC System When It Shouldn’t Be?

April 13th, 2026|4 min read

Why Do Hydronic Lines Freeze Even When Glycol Is Added?

April 1st, 2026|4 min read

Energy Reduction Options: VFDs, Setpoint Resets & Scheduling

February 4th, 2026|4 min read

Controls Upgrade Options: Standalone Controls vs BMS Integration

January 28th, 2026|5 min read

Preventive Maintenance | HVAC

How Does HVAC Maintenance Affect Humidity Control in Commercial Buildings?

January 2nd, 2026|4 min read

Preventive Maintenance | HVAC

Do Commercial HVAC Maintenance Contracts Really Lower Energy Bills

December 17th, 2025|4 min read

Preventive Maintenance

Is a Preventative Maintenance Plan Worth It for a Commercial Building?

November 26th, 2025|4 min read

Office Air Feels Stale? Your HVAC Might Be to Blame

October 13th, 2025|4 min read

How Building Management Systems Save Energy in Commercial Buildings

September 26th, 2025|4 min read

How to Achieve Energy Efficiency in Commercial Buildings

September 10th, 2025|4 min read

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