EcoTemp 3.5 Ton 15.5 SEER2 Air Conditioner & 100K BTU Condensing Furnace – 21" Cabinet System
This system steps up to 42,000 BTU of cooling while keeping a balanced furnace pairing. The W5A5S42AKAWA 3.5 ton R-454B condenser and the matching 3.5 ton W5AM42M21XA coil carry an AHRI-certified 15.5 SEER2 rating (AHRI 215097993). The 21 in. WFSX100C060B furnace delivers 97,000 BTU of heat at up to 96.3% AFUE. Larger single-story homes, two-story homes with open floor plans, and homes with bonus rooms often land at 3.5 tons, and this package covers them in a 21 in. indoor footprint with true like-for-like coil and condenser tonnage.
Is a 3.5 Ton, 100K BTU Gas System the Right Size?
A 3.5 ton system is often matched to homes of about 1,800 to 2,200 square feet, though climate and construction can shift that a great deal. Pairing it with 97,000 BTU of delivered heat suits mixed climates where winter and summer loads are both substantial, from the Carolinas and Tennessee to the lower Midwest.
At this size, airflow becomes the deciding factor. A 3.5 ton system needs considerably more air than a 3 ton, and undersized returns or long, restrictive duct runs can choke it. Pair a Manual J load with a Manual D duct review, and confirm the 21 in. cabinet and plenum fit the mechanical space.
Ideal for: Two-story homes, open-concept ranches, homes with bonus rooms or additions, and replacements of an existing 3.5 ton AC and 100K furnace.
Need more capacity? For more heat at this tonnage, see the EcoTemp 3.5 Ton 120K BTU Gas System (WFSX120D066B).
Recommended applications are general guidelines only. Actual system requirements depend on insulation, ductwork, climate, elevation, and a proper load calculation. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Condenser | W5A5S42AKAWA — 3.5 Ton Single-Stage R-454B Air Conditioner |
|---|---|
| Indoor Coil | W5AM42M21XA — 3.5 Ton Multipoise Cased A-Coil, 21" Wide, Factory TXV |
| Gas Furnace | WFSX100C060B — 100,000 BTU Input / 97,000 BTU Output Condensing Furnace |
| Furnace Cabinet Width | 21" (35" tall) |
| Cooling Efficiency | 15.5 SEER2 (AHRI 215097993) |
| Heating Efficiency | 96.3% AFUE Upflow & Horizontal / 95% AFUE Downflow |
| Refrigerant | R-454B |
| Compressor | Single-Stage Scroll Compressor |
| Condenser Electrical | 208/230V, Single Phase, 60 Hz — 22.7 MCA, 40A Max Fuse/Breaker |
| Furnace Electrical | 115V, Single Phase, 60 Hz — 12 AWG Min., 20A Breaker |
| Manufacturer Warranty | 10-Year Parts with Timely Registration; 20-Year Furnace Heat Exchanger |
Here the condenser and coil are both rated at 3.5 tons, and the coil's 21 in. width lines up with the 21 in. WFSX100C060B furnace. The furnace's 1 HP ECM blower can supply up to 2,145 CFM in cooling, well above what 3.5 tons requires, so the installer has room to tune airflow for dehumidification or longer duct runs. Compare other 3.5 ton high-efficiency gas furnace systems or add copper line sets for a new installation.
Condenser, Coil & Furnace Features
W5A5S42AKAWA Condenser & W5AM42M21XA Coil
- 42,000 BTU single-stage scroll compressor rated 17.3 RLA
- Large 22.0 sq. ft. two-row condenser coil with nine circuits
- 1/5 HP, 1,100 RPM direct-drive fan moving 4,900 CFM
- 7.2 lb factory R-454B charge; 7/8 in. vapor and 3/8 in. liquid lines
- 75 dBA standard sound rating (74 dBA with the sound shield)
- 6°F subcooling target with the TXV coil
- W5AM42M21XA: 29-3/4 in. tall, 21 in. wide, 7/8 in. suction
- Factory refrigerant sensor with a dissipation board in the parts box
- Foil-faced R-2.1 insulated cabinet for quiet operation
- Factory UV-light knockouts and brazeless-fitting-ready tube stubs
WFSX100C060B 100K BTU Condensing Furnace
- 97,000 BTU output at up to 96.3% AFUE
- 21 in. wide, 35 in. tall cabinet
- 1 HP constant-torque ECM blower: 375–2,145 CFM cooling range
- Five burners with a silicon nitride igniter
- Upflow, downflow, horizontal left, or horizontal right
- Direct vent, single-pipe, or ventilated combustion air
- 24 VAC HUM terminal and 115 VAC EAC terminal
- 3-digit diagnostic display and NFC setup
- Requires a field-supplied filter for each return-air inlet
- 20-year heat exchanger and 10-year registered parts limited warranty
Specifications & Manuals
Documentation includes condenser, coil, and furnace product data, installation instructions, line-set and venting tables, wiring diagrams, and warranty terms for selection, installation, and service.
Frequently Asked Questions
Can the WFSX100C060B blower handle 3.5 tons of cooling airflow?
Yes. Its cooling airflow range is 375 to 2,145 CFM at rated static pressure, which comfortably covers a 3.5 ton system with room for adjustment.
What circuit does the 3.5 ton W5A5S42AKAWA need?
A 208/230V single-phase circuit with a 22.7 minimum circuit ampacity and a 40 amp maximum time-delay fuse or breaker.
What air filter does the WFSX furnace use?
The filter is field-supplied, and one is required for each return-air inlet. Many installers use a filter rack or media cabinet. A high-efficiency media filter can reduce airflow by up to 7%, so factor that into blower setup.
What wire size does the 100K furnace circuit require?
The WFSX100C060B lists 12 AWG minimum wire and a 20 amp maximum fuse or breaker (time-delay recommended) on a 115V circuit.
Can I add a UV light to the indoor coil?
Yes. The W5AM coil has factory-installed UV knockouts, so a compatible UV light can be added without cutting the cabinet.
How loud is the 3.5 ton outdoor unit compared with smaller sizes?
The W5A5S42AKAWA rates 75 dBA, a few decibels above the 1.5 to 3 ton models (71–73 dBA), because it moves more air with a larger 1/5 HP fan. The sound shield accessory brings it to 74 dBA.
W5A5S Technical SpecificationsW5A5S Installation InstructionsW5A5S Customer BrochureW5AM Technical SpecificationsW5AM Installation InstructionsWFSX Technical SpecificationsWFSX Installation Instructions
ICP Warranty Certificate
