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Three-zone mini-split system consisting of one wall-mounted ductless unit, one ceiling-mounted ductless unit, and one ducted indoor unit, all connected to one outdoor unit

Three-zone mini-split system consisting of one wall-mounted ductless unit, one ceiling-mounted ductless unit, and one ducted indoor unit, all connected to one outdoor unit
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To attach the flex duct to a main trunk duct or any other connection, the flex duct is pulled over the connecting collar at least 2 inches past the raised bead, then the insulation is pulled back

To attach the flex duct to a main trunk duct or any other connection, the flex duct is pulled over the connecting collar at least 2 inches past the raised bead, then the insulation is pulled back
Video:

Total Duct Leakage Tests

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Two pieces of flex duct are spliced together with a metal sleeve, nylon draw bands, mastic, metal tape, and more mastic

Two pieces of flex duct are spliced together with a metal sleeve, nylon draw bands, mastic, metal tape, and more mastic
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Typical coaxial coil (liquid-to-refrigerant heat exchanger) used in a ground-source heat pump

Typical coaxial coil (liquid-to-refrigerant heat exchanger) used in a ground-source heat pump
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Typical ground-source plumbed system

Typical ground-source plumbed system
Video:

University of Minnesota-NorthernSTAR: A Natural Gas-Fired Combi System for Space Heating and Hot Water

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Use only Underwriters Laboratory UL-181 approved tape

Use only Underwriters Laboratory UL-181 approved tape
Presentation:

Variable Capacity Comfort Systems and Smart Ventilation Systems in High-Performance Homes

Variable Capacity Comfort Systems and Smart Ventilation Systems in High-Performance Homes
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Vented Attic vs Unvented Cathedral Attic Air Flow

Vented Attic vs Unvented Cathedral Attic Air Flow
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Vented crawlspace cripple wall has seismic retrofits – plywood is added on interior that fastens to extra blocking added at sill plate and connected to foundation with new anchor bolts

Vented crawlspace cripple wall has seismic retrofits – plywood is added on interior that fastens to extra blocking added at sill plate and connected to foundation with new anchor bolts
Case Study:

Veridian Homes: Cold Climate Region 40+% Energy Savings

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When HVAC systems are installed in enclosed garages, it is preferable that the equipment is located within an air-sealed room that is connected to the conditioned space.

When HVAC systems are installed in enclosed garages, it is preferable that the equipment is located within an air-sealed room that is connected to the conditioned space.
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When wrapping metal ducts with insulation allow two inches of overlap and staple along the seam with outward clinching staples

When wrapping metal ducts with insulation allow two inches of overlap and staple along the seam with outward clinching staples
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Whole house ventilation ensures adequate indoor air quality

Whole house ventilation ensures adequate indoor air quality
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Wind-Damage Reduction as a Function of Retrofit Level

Wind-Damage Reduction as a Function of Retrofit Level
CAD File:

Window head at window frame wall

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Window head at window frame wall
CAD File:

Window head at wood frame wall

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Window head at wood frame wall
CAD File:

Window sill at wood frame wall

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Window sill at wood frame wall
CAD File:

Window sill at wood frame wall

Preview Image
Window sill at wood frame wall
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With the nailed block method, wood blocks are attached to the sill plate and the cripple wall plywood is attached to the block to provide shear strength for correctly bracing a cripple wall in a seismic retrofit

With the nailed block method, wood blocks are attached to the sill plate and the cripple wall plywood is attached to the block to provide shear strength for correctly bracing a cripple wall in a seismic retrofit
Case Study:

WPPI GreenMax-Chambers Residence: Near Zero Energy Monitoring Summary

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Wrong - ERV heat exchange coils have not been cleaned and have become completely clogged with dirt.

Wrong - ERV heat exchange coils have not been cleaned and have become completely clogged with dirt.
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Wrong – This ductless mini-split heat pump was installed above an exterior door allowing conditioned air to escape when the door is opened, heat transfer through the door, and temperature fluctuations that could impact the unit’s thermostat.

Wrong – This ductless mini-split heat pump was installed above an exterior door allowing conditioned air to escape when the door is opened, heat transfer through the door, and temperature fluctuations that could impact the unit’s thermostat.