Custom HVAC Sizing
HVAC Sizing Request
Pick the system type that fits your project. Each page has a free load estimator that gives you a number on the spot, and when you want the engineered version we run a full ACCA Manual J calculation for you. We respond to every sizing request within 1 business day.
High Velocity Systems
High-velocity HVAC systems deliver conditioned air through small-diameter flexible ducts, making them ideal for retrofits in older NYC buildings where traditional ductwork installation is impractical. Perfect for:
- Historic brownstones and pre-war buildings
- Residential and boutique commercial spaces
- Retrofit projects without existing ductwork
- Applications requiring minimal visual impact
Low Velocity Systems
Low-velocity systems operate at reduced fan speeds, producing significantly quieter operation while maintaining superior air distribution and comfort. Ideal for:
- Luxury residential and high-end commercial spaces
- Noise-sensitive environments (bedrooms, offices, studios)
- Multi-zone configurations requiring independent control
- New construction with planned ductwork
Two ways to size a system
Both are ours. Start with the free one and move up when the decision gets expensive.
Free, instant
Load estimator
Built on the same physics a Manual J uses: real U-values per surface, infiltration, solar gain and the design temperatures for your ZIP. It assumes a roughly square footprint and average window sizes, so treat it as a strong starting point rather than a specification. No contact details, no wait.
Run the estimator$250, credited against your order
Full Manual J calculation
We run the real thing in software, room by room, off your floor plan and your actual window orientations. You get a document you can hand to your contractor, your board or your filing engineer, plus the equipment that matches the number and fits your opening. Back in 2 to 3 business days, and the fee comes straight off your equipment order.
Request a Manual JResponse time: 1 business day
We respond to all sizing requests promptly. Include as much project detail as possible for the most accurate quote.