Even, draft-free warmth
Heat radiates from the entire floor surface instead of blowing from vents, eliminating cold spots near windows and exterior walls.
Service 02
Infloor Radiant Heat
Nothing matches the comfort of warm floors on a -20°F Duluth morning. Design Heating has engineered and installed hundreds of infloor radiant systems across Northeastern Minnesota — from full-home new construction to single-room retrofits in older homes.
Overview
Custom-Designed for Duluth Homes
Infloor hydronic heat is one of the most comfortable and efficient ways to heat a home. Whether you are building new or upgrading an existing home, warm floors eliminate cold spots and deliver even heat throughout every room. We design every infloor system in LoopCad with proper tubing layouts, manifold sizing, and heat output calculations.
- New construction and retrofit installations
- On-slab, above-subfloor, and below-subfloor options
- Custom tubing layout designed in LoopCad
- Hundreds of infloor systems designed and installed
Why Choose This System
Engineered Benefits, Not Sales Pitches
20–30% lower operating cost
Radiant systems operate at lower water temperatures than baseboard or radiator systems, which means your boiler runs in condensing mode more of the time.
Silent, allergen-friendly
No fans, no blowing air, no dust circulation — ideal for households with allergies or asthma.
Custom-designed for every room
We design tubing layouts in LoopCad with per-room heat-loss numbers, manifold sizing, and balanced loop lengths.
Our Process
How a Infloor Radiant Heat Project Works
Every job follows the same documented workflow — from heat-loss calculation to final commissioning.
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1. Heat-loss analysis
Per-room Manual J calculation determines the BTU/hr each space needs.
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2. LoopCad design
We model tubing layout, loop lengths, manifold locations, and water temperatures for every zone.
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3. Tubing installation
PEX-A tubing is installed on-slab, above-subfloor (with aluminum plates), or below-subfloor with insulation.
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4. Manifold + commissioning
Stainless manifolds are balanced loop-by-loop, pressure tested, and tied into the boiler with outdoor reset controls.
Credentials
Owner-Installed, Owner-Accountable
Kevin Kaski personally designs and installs every Design Heating project — no sub-contractors, no rotating crews.
License
MN MB715020
Minnesota Licensed & Bonded
Geothermal
CGD Certified
IGSHPA Accredited Trainer & Installer
Engineering
Manual J + LoopCad
Every system sized by calculation, not guess
Reputation
4.9 ★ · 114 reviews
BBB Accredited · Founded 2016
Service Area
Where We Install Infloor Radiant Heat
Design Heating is based in Duluth, Minnesota and serves homeowners throughout Northeastern Minnesota and Northwestern Wisconsin — typically within a 30-mile radius of our shop on Washburn Road.
Design Heating, LLC5131 Washburn Road
Duluth, MN 55803
(218) 525-5914
- Duluth, MN
- Hermantown, MN
- Proctor, MN
- Pike Lake, MN
- Cloquet, MN
- Esko, MN
- Carlton, MN
- Two Harbors, MN
- Superior, WI
Frequently Asked Questions
Infloor Radiant Heat — Common Questions
Yes. We retrofit infloor radiant heat into existing homes regularly. The most common approach in Duluth-area retrofits is to install aluminum heat-transfer plates and PEX tubing under the existing subfloor from the basement — no demolition of finished floors required.
For new construction in the Duluth area, expect $8–$14 per square foot installed (tubing, manifolds, controls, and labor) depending on configuration. Below-subfloor retrofits typically run $10–$16 per square foot. Boiler and heat source are quoted separately.
Tile and stone are the highest-performing surfaces. Engineered hardwood, LVP, and low-pile carpet (under R-2) all work well. We avoid solid hardwood over slab and thick padded carpet, which insulate the heat from the room.
The PEX tubing itself carries 25–50 year manufacturer warranties and is generally expected to last the life of the building. The manifolds, pumps, and boiler will need service over time, but the in-floor portion is essentially permanent.
Absolutely. Most of our designs use separate thermostats and manifold zone valves so bedrooms, bathrooms, and living areas can each be set independently — bathrooms warmer in the morning, bedrooms cooler at night.
Yes. Low-temperature radiant systems pair extremely well with air-to-water heat pumps and ground-source (geothermal) heat pumps. Because the water temperature only needs to be 95–110°F, the heat pump runs at peak efficiency.
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Ready to Get Started?
Free in-home consultation, Manual J heat-loss calculation, and a written, itemized quote — every time.