A two-stage furnace earns its keep on cold mornings and uneven weather swings, and picking the right setup means weighing your home’s footprint against the controls that run it. The lineup below covers whole-unit natural gas furnaces alongside the thermostats and propane regulators that round out a complete installation. You will find options sized for modest single-family layouts and bigger homes that need extra output on the coldest nights.
The Lineup, Simplified
Suuwer 5-1-1 Day Programmable Thermostat 2 Heat/2 Cool
Heagstat 5-1-1 Day Programmable Thermostat 2 Heat/2 Cool
CALPOSE 2 Stage Propane Regulator with POL
Coiiwsei Programmable Thermostat 2 Heat/2 Cool White Backlight
Coiiwsei Programmable Thermostat 2 Heat/2 Cool Blue Backlight
Goodman 96% AFUE Two-Stage Upflow/Horizontal 100k BTU Furnace
Goodman 96% AFUE 60k BTU Single-Stage Furnace with Thermostat
The Strengths Of Each Pick
Multistage systems (heaters that run in steps, low and high, instead of one hard blast) can be fussy about which wall control you pair them with, and the Suuwer 5-1-1 leans into that flexibility. It supports conventional multistage setups, single-stage setups, and even hydronic boiler and forced-air furnace-only homes, so it often slots in as a replacement for older thermostats without forcing a rewire.
Daily scheduling uses a 5-1-1 layout, meaning five weekday settings plus separate Saturday and Sunday blocks, which suits shift workers and families whose weekend routine does not look like Monday through Friday. For most homes running a 2 heat, 2 cool configuration, the unit lands in a comfortable middle ground between stripped-down manual dials and app-connected smart thermostats.
Practical Advantages
- Works with multistage, single-stage, boiler, and furnace-only systems, which broadens the homes it fits.
- Five weekdays plus separate weekend schedules let you match comfort to your real routine.
- Supports two heating and two cooling stages, matching the wiring most 2 stage furnaces expect.
- Backlit display helps with quick adjustments in dim hallways or basements.
Worth Noting
- Installation requires careful wire matching; people without HVAC wiring experience may find the setup intimidating.
- No app or Wi-Fi connectivity, so remote adjustments are off the table.
Who It Suits Best
Homeowners running a conventional multistage gas furnace who want dependable scheduling without paying smart-thermostat prices.
Look Elsewhere When
Heagstat H715 shoppers who want a gentler first-time setup with a clear white backlight should consider that sibling instead.
The H715 keeps things simple, and that is the point. Suuwer offers broader system reach, while this unit trims the experience down to a manual, no-fuss interface that older homeowners and first-time installers tend to appreciate. You get up to 2 heat and 2 cool stages, which covers most multistage furnace pairings in single-family homes.
Programming uses the same 5-1-1 weekday and weekend split, with four periods each day for wake, leave, return, and sleep. The white backlight is gentle in a dark bedroom and large enough to read across the room, which matters more than it sounds during a 2 a.m. blanket scramble.
Points In Its Favor
- Conventional single-stage and 2 stage furnace compatibility covers the bulk of home HVAC setups.
- Forced air gas, oil, and electric systems all work with this unit.
- Four daily periods for wake, leave, return, and sleep mirror how most families actually live.
- Large, well-lit white display is easy to read for older eyes and at night.
Minor Gripes
- No smart features, so any schedule change happens at the wall.
- Some households may want a larger screen or color options for style reasons.
Made For
First-time thermostat swappers and homeowners who want straightforward, no-app scheduling on a 2 stage furnace system.
Where Another Pick Suits Better
Shoppers wanting blue-tinted night lighting in a darker hallway should look at the Coiiwsei thermostat with blue backlight instead.
Most of this roundup focuses on natural gas, but propane-powered homes and RVs have their own pressure-control needs. The CALPOSE 2 Stage Propane Regulator uses a two-stage design to step tank pressure down to a stable appliance level (BTU/hr, or British Thermal Units per hour, measures heating output) and supports up to 160,000 BTU/hr, which is plenty for a whole-house propane furnace plus a water heater.
The POL fitting (a standard left-hand thread used on propane tanks) makes it a drop-in fit for many residential and RV propane setups. Tool-free mounting keeps installation friendly for homeowners who would rather not dig out a torque wrench.
What Helps Most
- 160,000 BTU/hr capacity handles a whole-house propane furnace and a secondary appliance at the same time.
- Two-stage regulation smooths out pressure swings that single-stage regulators can let through.
- Tool-free mounting and easy disassembly make seasonal swaps and inspections less of a chore.
- Durable construction is built for outdoor weather exposure, which is where most regulators live.
A Few Limitations
- This is a regulator, not a furnace, so it is a niche pick in a 2 stage furnace roundup.
- Some users will need a qualified technician to confirm hose and fitting compatibility on older systems.
Best Suited To
Propane-heated homes, off-grid cabins, and RV owners running high-demand appliances that need steady gas pressure.
Skip It When
Shoppers looking for an actual whole-house furnace should consider the Goodman 96% AFUE Two-Stage Upflow/Horizontal 100k BTU Furnace instead.
Where Suuwer and Heagstat split their attention across multistage and forced-air systems, the Coiiwsei white-backlight model pushes further down the compatibility list. It works with single-stage and multistage systems, electric furnaces, hot water steam, gravity radiant heat, heat-only systems, millivolt gas fireplaces, and floor or wall furnaces, which makes it a strong fit for older homes with mixed equipment.
The 2 heat and 2 cool stage control matches the wiring of most two-stage furnace pairings, and the white backlight reads clearly in hallways. For households that run a heat pump on the cooling side and a separate gas furnace on the heating side, this thermostat often bridges the gap without needing extra relays.
Notable Gains
- Single-stage and multistage compatibility covers most 2 stage furnace installations.
- Works with electric furnaces, hot water steam, gravity radiant heat, and millivolt gas fireplaces, which widens the install base.
- Heat pump systems without auxiliary heat are supported for homeowners with split equipment.
- White backlight keeps the screen visible without harsh glare in bedrooms.
Points To Note
- Compatibility is wide, so double-check your specific system type before buying.
- Lacks smart-home integration for anyone wanting phone-based control.
Right Fit For
Households with mixed or older HVAC equipment who need a flexible wall control and a 2 stage furnace wiring layout.
Not Your Match When
Buyers who want a true two-stage gas furnace should consider the Goodman 96% AFUE Two-Stage Upflow/Horizontal 100k BTU Furnace instead.
The blue-backlight sibling of the Coiiwsei shares the same broad system support as the white-backlight version. Single-stage and multistage setups, electric furnaces, hot water steam, gravity radiant heat, millivolt gas fireplaces, and floor or wall furnaces all sit on the supported list, which is unusual at this price point for a 2 heat and 2 cool control.
Where the two diverge is the glow itself. Blue backlighting reads more clearly in darker hallways and basements, and many homeowners simply prefer the cooler tone over warm white when checking the temperature at night. The 5-1-1 program layout keeps weekday and weekend routines independent.
The Value In It
- Blue backlight is easier to read in dim basements and overnight.
- Broad HVAC compatibility matches mixed-equipment households.
- Supports 2 heat and 2 cool stages for two-stage furnace wiring.
- 5-1-1 programming with four daily periods fits most home schedules.
Soft Spots
- No Wi-Fi, so all adjustments happen at the wall.
- Blue light can be too bright for some bedroom setups depending on placement.
Who Should Grab It
Homeowners with a mixed HVAC system who want stronger nighttime visibility than white backlighting offers.
Consider Something Else When
Shoppers wanting a gentle white glow for a bedroom should consider the Heagstat H715 thermostat instead.
This is the first real furnace in the lineup, and the GR9T961004CN delivers a genuine two-stage gas burn rather than a single-stage furnace. The AFUE rating of 96% (Annual Fuel Utilization Efficiency, meaning 96% of fuel becomes heat) puts it in condensing territory, which is where most modern high-efficiency furnaces sit, and 100,000 BTU output suits larger homes in cold climates.
The multi-speed ECM (Electronically Commutated Motor) blower ramps airflow up and down with heating demand, which keeps the home quieter than single-speed blowers on low fire. Upflow and horizontal installations are both supported, but downflow requires a different model altogether, so check your duct layout before committing.
What Makes Sense
- True two-stage gas heating reduces temperature swings and cold spots in larger homes.
- 96% AFUE means less fuel waste and lower heating bills over a long winter.
- Multi-speed ECM blower adjusts airflow to match low and high fire.
- Upflow and horizontal configurations fit most basement and attic installations.
Things To Consider
- Professional installation is strongly recommended for any 96% AFUE gas furnace.
- Cannot be installed as a downflow, so households with that duct layout need a different model.
Built With In Mind
Larger single-family homes in cold climates where a true two-stage burn cycle and high-efficiency heat exchange justify the install work.
Reach For A Different Pick When
Shoppers wanting a simpler replacement with a thermostat included should consider the Goodman 96% AFUE 60k BTU Single-Stage Furnace bundle instead.
The GM9S960603BN is a single-stage furnace, not a true two-stage, but it earns its place in this roundup because the bundle includes a matching thermostat, which simplifies whole-system replacements. At 60,000 BTU output and 96.1% AFUE, it fits mid-sized homes and warmer climates where a two-stage burn is less critical.
The nine-speed ECM blower motor is a real upgrade over older single-speed designs, giving installers finer airflow control to balance the duct system. Upflow and horizontal installations are supported, and the aluminized-steel heat exchanger is paired with a stainless-steel secondary heat exchanger for durability.
Real Benefits
- 96.1% AFUE keeps fuel use low, even on a single-stage burn cycle.
- Nine-speed ECM blower balances airflow room to room and runs more quietly than single-speed units.
- Aluminized-steel primary heat exchanger with stainless secondary adds service life.
- Thermostat included removes the guesswork of pairing compatible controls.
Honest Caveats
- Single-stage operation means more on-and-off cycling than a true two-stage furnace.
- 60,000 BTU is undersized for very large or poorly insulated homes in cold climates.
Whose Shelf It Belongs On
Mid-sized homes in moderate climates where a full system swap and bundled thermostat are the priority.
A Better Fit Elsewhere
Shoppers in cold climates wanting true two-stage heating should consider the Goodman 96% AFUE Two-Stage Upflow/Horizontal 100k BTU Furnace instead.
What To Weigh Before Picking A 2 Stage Furnace
A two-stage furnace runs at a low fire most of the time and ramps up to high fire only on the coldest mornings, so the comfort gains show up over the long haul. Begin with the heating load of your home, measured in BTU/hr, because undersized units short-cycle in winter and oversized ones waste fuel. Cold-climate households benefit most from a true two-stage gas burn, while moderate regions often do fine with a high-efficiency single-stage model.
Next, match the thermostat to the system, not the other way around. A multistage furnace needs a 2 heat and 2 cool thermostat; a single-stage furnace only needs 1 heat and 1 cool, though 2-stage thermostats still work fine. The Suuwer, Heagstat, and Coiiwsei controls on this list all support two-stage wiring, which keeps options open if you upgrade the furnace later.
Ductwork and venting drive the install cost as much as the furnace itself. A 96% AFUE condensing furnace pulls condensate from the exhaust and needs a drain line, while an 80% unit vents through standard metal pipe. Upflow and horizontal cabinet orientations fit most basements, attics, and crawlspaces, but downflow setups need a different model family entirely.
Smart Buying Advice For 2 Stage Furnace Shoppers
Pitfalls Shoppers Hit
The most common mistake is buying a thermostat before checking system compatibility, which can leave you with a wall control that does not match the furnace wiring. Always confirm whether your system is single-stage, two-stage, or heat pump before ordering. Another slip is ignoring the duct layout, because a furnace that physically does not fit the planned install direction becomes a return trip.
Where The Extra Money Goes
Higher-tier two-stage furnaces cost more because of the gas valve, the multi-speed ECM blower, and the secondary stainless-steel heat exchanger. These parts reduce temperature swings, lower noise, and stretch service life. The upgrade pays off in homes with bigger square footage, longer run times, or stricter noise expectations, but smaller homes in mild climates may not see enough comfort difference to justify the spend.
Frequently Asked Questions
What does two-stage mean on a furnace?
A two-stage furnace can run at a low and a high burn level, cycling between them based on heating demand, which keeps temperatures steadier than single-stage on-and-off operation.
Do I need a special thermostat for a 2 stage furnace?
Yes, a 2 heat and 2 cool thermostat is required to control both burn stages, and all four wall thermostats in this roundup support that wiring.
Is 96% AFUE worth the higher install cost?
In cold climates with long heating seasons, 96% AFUE condensing furnaces typically pay back the install premium over several years through lower fuel use, though warmer regions may see a longer payback.
Can a 2 stage furnace be installed in a downflow configuration?
Some can, but the Goodman units on this list are upflow and horizontal only, so households with downflow ductwork should look for a model rated for that orientation.
Is single-stage heating ever the right call?
For smaller homes in mild climates, a high-efficiency single-stage furnace with a nine-speed blower can deliver solid comfort at a lower install cost.
