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Guide describing categories of direct-vent combustion space- and water-heating equipment and combustion safety testing.

Guide describing the testing of duct leakage in central ventilation systems for multi-story, multi-family buildings.

Guide describing how to conduct duct leakage tests per RESNET protocols on all components of the HVAC system (including the air handler, ductwork, register boxes/boots, and all air devices such as diffusers, registers, or grilles).

Guide describing the use of ducted returns to return stale air from bedrooms and bathrooms to a central heating system.

Guide describing ductless heat pump systems used for single-room or whole-house heating and cooling.

Guide describing the practice of burying HVAC ducts in loose-fill insulation on the attic floor.

Guide describing approaches to burying and encapsulating ducts in unconditioned attics to increase the overall R-value of duct insulation.

Guide describing method for installing ducts in a duct chase in a dropped ceiling.

Guide for designing and installing interior ducts in an interstitial floor cavity in new and existing homes.

Guide describing method for designing and installing ducts in a raised ceiling chase.

Guide describing the use of electronically commutated motors (ECMs) in HVAC central air handler fans to reduce power consumption compared to a single-stage fan motor.

Guide describing methods for providing space cooling and refrigeration during extreme heat events and/or power outages.

Guide that illustrates how and when to encapsulate ductwork in unconditioned attics, increasing the R-value of duct insulation, mitigating condensation issues, and reducing air leakage.

This guide describes evaporative cooling technologies which can be used to cool homes in dry climates.

Guide describing how to upgrade or expand an existing HVAC system.

Guide describing how to provide combustion air for fireplaces and how to test fireplaces for combustion safety.

Guide describing fuel tank anchoring practices for disaster resistance.

Guide describing sizing and installation of foundation heat exchangers, which can be connected to a heat pump system used for spacing conditioning as well as domestic water heating.

Guide describing ground-source (geothermal) heat pumps including an overview of technology and guidance on compliance and installation.

Guide describing best practices for testing and commissioning heat pump systems using smart tools during and after installation.

Guide describing the uses, selection process, and specification of high-MERV filters.

Guide describing the use of building cavities as supply or return ducts.

Guide describing how to install a corrosion-resistant drain pan in condensate-producing HVAC equipment.

Guide describing indoor air quality (IAQ) sensors and how to use them inside a home.

HVAC

Direct Vent Equipment

Duct Leakage Testing for Central Exhaust and Ventilation Systems in Multifamily Buildings

Duct Leakage Tests

Ducted Returns

Ductless (Mini-Split) Heat Pumps

Ducts Buried in Attic Insulation

Ducts Buried in Attic Insulation and Encapsulated

Ducts in Dropped Ceilings

Ducts in Interstitial Floor Framing

Ducts in Raised Ceiling Sections

ECM Air Handler Fans

Emergency Air Conditioning and Food Refrigeration

Encapsulated Ducts

Evaporative Cooling Systems

Existing HVAC System Upgrade or Expansion

Fireplaces and Wood Stoves Have Proper Ventilation

Fuel Tanks Anchored for Disaster Resistance

Ground-Source Heat Pump Foundation Heat Exchanger (FHX)

Ground-Source Heat Pumps

Heat Pump Quality Installation and Commissioning

High-MERV Filters

HVAC Ducts Shall Not Be Run within Exterior Walls

HVAC has Corrosion-Resistant Condensate Drain Pan

Indoor Air Quality Sensors