Name: Ashrae Baseline Guide
Author: NatLabRockies

ASHRAE 90.1 Appendix G Baseline System Selection

System Selection (Table G3.1.1)

Select baseline system based on building type, heating fuel, and floor area / floor count.

Residential Buildings

(hotels/motels, dormitories, apartments)

Heating Source	System
Fossil fuel / hybrid	System 1: PTAC (any size)
Electric resistance	System 2: PTHP (any size)

Non-Residential Buildings

Heating Source	< 25,000 ft2	25,000-150,000 ft2	> 150,000 ft2
Fossil fuel / hybrid (<=3 floors)

#	Name	Equipment Level	Heating	Cooling	Plant Loops
1	PTAC	Zone	Electric resistance	DX single speed	None
2	PTHP	Zone	DX heat pump + elec backup	DX heat pump	None
3	PSZ-AC	Central (single zone)	Gas furnace or elec	DX single speed	None
4	PSZ-HP	Central (single zone)	DX HP + elec backup	DX heat pump	None
5	Pkg VAV w/ Reheat	Central (multi zone)	HW reheat coils	DX two speed	Hot water loop + boiler
6	Pkg VAV w/ PFP	Central (multi zone)	Electric PFP boxes	DX two speed	None
7	VAV w/ Reheat	Central (multi zone)	HW reheat coils	Chilled water	HW + CHW + condenser loops
8	VAV w/ PFP	Central (multi zone)	Electric PFP boxes	Chilled water	CHW + condenser loops
9	Gas Unit Heater	Zone	Gas unit heater	None	None
10	Electric Unit Heater	Zone	Electric unit heater	None	None

Action	Tool	Key Parameters
Create baseline system	`add_baseline_system`	`system_type`, `thermal_zone_names`, `heating_fuel`
List available systems	`list_baseline_systems`	(none)
System details	`get_baseline_system_info`	`system_type`
Modern alternatives	`add_doas_system`, `add_vrf_system`, `add_radiant_system`	`thermal_zone_names`

Scenario	Recommendation
High ventilation requirements (labs, hospitals)	DOAS with fan coils or chilled beams
Many small zones with diverse loads	VRF heat pump system
Comfort-critical spaces, radiant heating/cooling	Radiant floor/ceiling
Net-zero or high-performance target	DOAS + Radiant or DOAS + VRF

Ashrae Baseline Guide

ASHRAE 90.1 Appendix G Baseline System Selection

System Selection (Table G3.1.1)

Residential Buildings

Non-Residential Buildings

Ashrae Baseline Guide

ASHRAE 90.1 Appendix G Baseline System Selection

System Selection (Table G3.1.1)

Residential Buildings

Non-Residential Buildings

Heated-Only Buildings

System Summary

Heating Fuel Logic

Economizer Applicability

Multi-Zone Constraints

Tool Mapping

Feishu Perm

Logistics Exception Management

Review

Employment Contract Templates

On-Call Handoff Patterns

Advogado Criminal

Heating Source	System
Fossil fuel / hybrid	System 9: Gas Unit Heater
Electric resistance	System 10: Electric Unit Heater

Ashrae Baseline Guide

ASHRAE 90.1 Appendix G Baseline System Selection

System Selection (Table G3.1.1)

Residential Buildings

Non-Residential Buildings

Ashrae Baseline Guide

ASHRAE 90.1 Appendix G Baseline System Selection

System Selection (Table G3.1.1)

Residential Buildings

Non-Residential Buildings

Heated-Only Buildings

System Summary

Heating Fuel Logic

Economizer Applicability

Multi-Zone Constraints

Tool Mapping

When to Recommend Modern Templates Instead

Feishu Perm

Logistics Exception Management

Review

Employment Contract Templates

On-Call Handoff Patterns

Advogado Criminal