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About Breen Design
Breen Design has operated as a residential HVAC engineering firm in Denver since 2010, delivering load calculations and system designs for home builders across Colorado and the nation. The firm holds an A+ rating with the Better Business Bureau and maintains a perfect 5.0-star average across 23 verified client reviews. Working from Jefferson County, the team serves builders and developers in Englewood, Gilbert, Chandler, and Mesa, while also completing design projects for jurisdictions as far east as Washington D.C. and as far west as Arizona. Their client base includes production builders, custom-home developers, and architectural firms seeking precise HVAC engineering that passes municipal code review on the first submission.
The firm differentiates itself through deep expertise in the three foundational HVAC engineering manuals: Manual J for heating and cooling load calculations, Manual S for equipment selection, and Manual D for duct system design. Breen Design is an authorized dealer for Rheia air distribution systems, a brand that several reviewers cite for measurable cost savings compared to conventional options. The firm also performs blower door testing and duct leakage testing in-house, allowing builders to verify energy code compliance before framing inspection. Their project planning worksheet enables pricing based on conditioned square footage, and they offer flexible fees that adjust according to project scope and volume.
Homeowner Keith S. worked with Breen Design on a new custom home build and received a detailed Manual J report along with direct answers to his technical questions. Builder Ron P. has entrusted Carl Breen with Manual J calculations for six years, reporting consistent on-time or early delivery. Architect Nick Young specifically notes that Breen Design's experience across multiple jurisdictions reduces plan review comments from city building departments. These client scenarios illustrate a firm that prioritizes technical accuracy and clear communication with everyone from solo homeowners to high-volume production builders.
What Customers Say
All 23 reviews award 5 stars, with multiple clients praising Carl Breen by name for responsiveness, technical accuracy, and meeting tight construction timelines. Reviewers highlight the firm's strength in energy code compliance and design work that minimizes municipal corrections.
Services
Manual J Load Calculations
Residential heating and cooling load analysis determining precise BTU requirements for new home builds.
Manual S Equipment Selection
Sizing and specification of furnaces, air conditioners, and heat pumps based on calculated load data.
Manual D Duct System Design
Layout and sizing of duct runs, registers, and returns ensuring proper air distribution.
REScheck Compliance Verification
Energy code compliance review confirming the design meets state and municipal efficiency standards.
Rheia Air Distribution Systems
Supply and design of Rheia ducted systems, a brand several reviewers cite for cost-effectiveness.
Blower Door Testing
Diagnostic testing to measure building envelope airtightness and identify air leakage paths.
Duct Leakage Testing
Pressurization testing to quantify air loss in ducted systems before drywall installation.