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My 1750 single-family house is currently gutted down to the studs, giving us a clean slate to run brand-new flexible ducting throughout the entire structure. The existing oil-fired, forced-air furnace and tank sit in the basement and will remain as the air-handling core, so every new supply and return line must tie neatly into that equipment. Scope • Design and install a complete flexible-duct distribution system that reaches every room. • Size trunks, branches, supply registers, and returns so the furnace can deliver balanced airflow without excessive static pressure. • Route, hang, seal, and insulate all flex runs to meet current code and eliminate leakage. • Leave clear access for future service and any eventual central-air add-on. Site Conditions The house is wide open—no drywall, flooring, or ceilings to work around—so layout efficiency and neat strapping are expected. Power, lighting, and a clean staging area are available in the basement for fabrication and assembly. Acceptance I will consider the job complete when: • All supply and return points show the target CFM at the registers. • Connections to the furnace plenum are airtight and properly supported. • The entire run passes local mechanical inspection and a basic smoke/leak test. • The work area is swept and debris removed. If you have experience with retrofits in older timber frames, knowledge of Manual D or equivalent sizing methods, and can start soon, I’d like to hear how you would approach the layout and timeline.
Project ID: 40643779
5 proposals
Active 11 days ago
Location: Rocky Hill, United States
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5 freelancers are bidding on average $1,950 USD for this job

I’m interested in assisting with the HVAC duct distribution design for your 1,750 sq. ft. single-family home. My professional engineering team has experience with residential HVAC design, duct sizing, airflow calculations, and coordination with existing forced-air equipment. We can develop an efficient supply and return layout, size trunks and branches using Manual D principles, coordinate connections to the existing furnace, and provide clear routing details for installation. We will also account for proper support, insulation, sealing, static pressure, balanced airflow, and future central-air integration. Since the home is currently gutted, we can take advantage of the open framing to develop a clean and serviceable duct layout while maintaining compliance with applicable mechanical codes. I’d be happy to review the existing furnace information, floor plans, and site conditions and provide a practical layout, scope, and timeline. Best regards,
$2,250 USD in 7 days
5.0
5.0

Hello, I am a licensed Mechanical PE with over 20 years of experience in residential HVAC design, duct distribution, airflow balancing, and retrofit work in older homes. Your gutted 1750-era house provides an excellent opportunity to design a clean, efficient system before finishes are installed. My scope can include: • Room-by-room heating/load review • Manual D duct sizing and layout • Supply and return CFM schedules • Trunk, branch, register, and return sizing • Flexible-duct routing and support requirements • Furnace plenum and transition details • Static-pressure verification • Sealing, insulation, and balancing specifications • Future central-A/C coordination I will design the system around the existing oil-fired forced-air furnace while maintaining service access and minimizing unnecessary flex length and pressure loss. Please provide the house location, floor plans, furnace model/capacity, and approximate conditioned square footage.
$1,500 USD in 7 days
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I am a Professional Engineer licensed in New York, New Jersey and Puerto Rico with multi-state NCEES records. I have previous experience in historic housing in Old San Juan. My mechanical engineering background will provide the MPE work skills required in your job description. Deliver drawings using AutoCad and VectorWorks. You have not mentioned if you will take management of the compliance and permits. I will offer to follow due diligence required to secure all design work is aligned to your local codes.
$2,250 USD in 14 days
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Hello, I have experience designing and installing residential HVAC duct systems, including retrofits in older homes. I can develop a balanced flex-duct layout using Manual D principles, properly size trunks, branches, supplies, and returns, and ensure airtight connections, insulation, support, and accessible routing. I can coordinate the system around the existing furnace while allowing for a future central-air upgrade. I focus on efficient installation, code compliance, airflow performance, and clean workmanship.
$2,250 USD in 7 days
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