Gas Furnace

Aire Flo

95AF
92AF
2 Stage 95AF2V

Amana

GMVM96
GMVC95 Distinctions
GMH95 Distinctions
GKS9 Distinctions
GCVM96-Distinctions
GCVC95 Distinctions
GCH95 Distinctions
AMVM96
AMVC95
AMEH96
AKSS92
ACVM96
ACVC95
ACSH96

American Standard

Silver ZI
Platinum ZV
Platinum SV
Gold ZM
Gold XM
Gold XI

Armstrong

A97MV
A952SV
A952E
A951S
A951E
A951A
A931A

Bryant

987M Evolution
986T Evolution
925T Preferred
925S Preferred
922S Preferred
915S Legacy
912S Legacy

Carrier

Performance 96
Performance 95
Performance 90
Infinity 98
Infinity 96
Comfort 95
Comfort 92

Coleman

LX Series TM9X
LX Series TM9V
LX Series TM9T
LX Series TM9M
CPLC Echelon
CP9C Echelon

Ducane

95G2V
95G2E
95G1E
95G1
92G1

Frigidaire

FG7TL-VS Downflow
FG7TL Downflow
FG7TC-L-VS
FG7TC
FG7SM Downflow
FG7SL Downflow
FG7SD
FG7SC
FG7MQ iQ Drive

Goodman

GMVM96
GMVC95
GMH95
GME95
GKS95
GCVM96
GCVC95
GCH95

Keeprite

PS95
PS92
PS90
IIX 96
ET 96
EC97

Lennox

Signature SLP98V
Merit ML195
Merit ML193
Elite EL296V
Elite EL296E
Elite EL195E

Luxaire

TG9S
LX TM9X
LX TM9V
LX TM9T
LX TM9M
Acclimate LP9C

Napoleon

9700
9600
9500
9200

Payne

PG96VAT
PG95XAT
PG95S
PG92S

Rheem

Value RGTS Downflow/Horizontal
Value RGRT/RGRS Upflow
Pretige RGFG Upflow
Prestige RGJF
Prestige RGGE
Prestige R96V
Classic RGTM
Classic RGTK Downflow
Classic RGTA Downflow/Horizontal
Classic RGRM Upflow
Classic RGRK Upflow
Classic RGRA/RGRB Upflow
Classic R96T
Classic R96P
Classic R95P
Classic R92P

Rinnai

EX22C
EX17C
EX11C
EX08C
ES38

Ruud

Value RGTS Downflow/Horizontal
Value RGRS upflow
Ultra U96V
Ultra RGJF Horizontal
Ultra RGGE Downflow
Ultra RGFG Upflow
Achiever RGTM Downflow/Horizontal
Achiever RGTK Downflow/Horizontal
Achiever RGTA Downflow/Horizontal
Achiever RGRM Upflow
Achiever RGRK Upflow
Achiever RGRA Upflow
Achiever R95P
Achiever R92P
Achiever Plus R96P
Achiever Plus R95T

Trane

XV95
XT95
XR95
XL95
XC95M
XB90

York

York LX TM9V
LX TM9M
Affinity YPLC
Affinity YP9C

Below is a typical illustration of high efficiency furnace system. It's great to be familiar with the terms in this diagram

  • The blower in the bottom of furnace pushes air through Plenum and Supply Duct to every room then back from Return Duct and Boot into furnace

  • High efficiency furnace can be vented through a side wall via PVC piping

Main features to be considered when buying a furnace:

1. Efficiency

  • Higher efficiency models save heating costs and are worth the extra initial investment.

  • In Canada, all furnace on market must be high efficiency (92% or above).

 

2. Heating capacity

  • Ideally, a heat loss calculation should be performed in order to determine the heating capacity of the furnace. However, in most cases, the homeowner can’t provide the necessary detailed information such as building materials of the whole house. For this reason, it’s normally very difficult to accurately project heat loss.

  • Taking a reference from your existing furnace is good way to determine what heating capacity you’ll need from your new furnace. Check the heating output of your existing furnace (remove the front panel of the furnace and you’ll find a label with all important data of your furnace like serial number, model number, input BTU and output BTU) and choose a furnace with a similar heating capacity.

 

3. Blower

The blower plays a very important role in heating and cooling system. The blower pushes air inside the ductwork and distributes energy to rooms inside the house. It is not only used by the furnace but also by the air conditioner.

  • The best blower type is variable speed (also called DC motor). This type of blower can increase or decrease speed based on airflow needed. It’s quieter and more efficient on hydro consumption. It provides better air circulation. In the summer, it helps the central air conditioner achieve higher efficiency and better dehumidification.
  • The second level is a multi speed blower which can create airflow in a few different speeds.

  • Regular is fixed speed blower. It’s either on or off regardless of weather conditions.   

 

4. Burner stage

The heat needed inside the house is not a constant and it varies depending on the weather. For example, in order to keep temperature in house at 25 degrees, if outside temperature is minus 15, it might need burner to produce 80,000 BTU per hour. If the temperature outside is minus 2, it might need 50,000 BTU. If outside temperature is 5 degree, it might only need burner to produce 35,000 BTU

  • The best type is modulating burner which can increase heating output incrementally so it has ability to produce heat to best match weather condition.

  • The second-best type is two stage burner which can provide heating output either 60% or 100% of its heating capacity.

  • Single stage burners don’t have any flexibility in terms of heat output. It’s either on or off regardless of weather conditions.

 

Factors related installation:

1. Venting

  • New furnace will be vented by two PVC pipes through side wall. One pipe is for fresh air intake and another pipe is for exhaust.

  • Vent terminal on outside wall has to be 3 feet away from gas meter and 12" away from the opening like window or door.

 

2. Draining of condensation water

  • High efficiency furnace will make condensation water while in use.

  • Condensation water comes out from bottom of furnace. It can easily run to floor drain. Or if there is no floor drain around, a condensation pump should be installed to get rid of the condensation water.

 

Further factors to be considered

1. Air cleaner

  • It's installed between furnace and return duct.

  • It cleans air and provides protection for furnace heat exchanger and air conditioner coil

 

2. Insulation of house

  • Regardless of how high the furnace efficiency is or how good the blower is, the insulation of the house plays the most important role in terms of energy consumption.

  • If house insulation is poor, it can't retain the heat therefore furnace is more frequently called in and works for a longer period of time. It not only increases energy consumption but also shortens the lifespan of furnace.

  • If upgrading insulation of the entire house is not possible, to upgrade insulation in the attic is always the most cost-effective way to reduce heating expenses.

 

3. Rebate

  • There usually are some rebates available from different sources. For example, Ontario Power Authority offer $250 rebate for furnace replacement if the new high efficiency furnace has EMC motor

  • OPA rebate link

  • Enbridge Community Energy Conservation Program offers up to $2000 rebate for certain area. Check here to see if you qualify.

 

4. Warranty

  • Nowadays, most brands offer very generous warranty terms. 10 years on parts and lifetime on heat exchange are normal in the marketplace today.

  • Labor warranty usually is provided by contractor who installs furnace. One year is typical term.