Who makes Evcon furnace?
Evcon furnaces are made under the Coleman family of HVAC brands; Evcon is commonly associated with Coleman and York-branded heating and cooling equipment. For your Coleman Evcon furnace model DGAT090BDD, use the model number when identifying the correct replacement parts and diagrams on Sears PartsDirect.
What “Evcon” means on the nameplate
Evcon is a brand name used on certain gas furnaces and other HVAC equipment. In practice, you will often see Evcon grouped with:
- Coleman (the brand shown for model DGAT090BDD)
- York (a closely related HVAC brand family)
- Evcon (the label used on the furnace cabinet or rating plate)
Why the manufacturer name matters for parts
The maker and brand family help you match the right components for your exact furnace configuration (ignition type, control board style, blower setup, and safety switches).
Common furnace parts that are brand and model sensitive
- Ignition control board
- Hot surface igniter
- Flame sensor
- Pressure switch
- Inducer motor
- Blower motor and capacitor
Quick check: what to use when ordering parts
Use the rating plate information, not just the “Evcon” label.
| What you have | What to enter when searching parts | Why it helps |
|---|---|---|
| Brand on the listing | Coleman | Matches the parts catalog family |
| Model number | DGAT090BDD | Targets the correct diagrams and part list |
| Serial number | Keep for reference | Helps confirm production run details |
Why it matters
Furnace parts are not universal. Even within the same brand family, small design changes can affect which igniter, control, or pressure switch fits and operates safely.
Last updated: February 2026
How many square feet will a 90,000 BTU furnace heat?
A 90,000 BTU furnace (like many Coleman Evcon furnace setups that use model DGAT090BDD) typically heats about 1,500 to 3,000 square feet, depending on climate, insulation, air sealing, ceiling height, and duct condition. For accurate sizing, we use a Manual J heat-loss calculation.
Quick sizing rule of thumb (BTU per square foot)
Use these common planning ranges to estimate coverage:
- Mild climates, tight/insulated home: 25 to 35 BTU per sq ft
- Mixed climates, average insulation: 35 to 45 BTU per sq ft
- Cold climates, older or drafty home: 45 to 60 BTU per sq ft
- High ceilings or lots of glass: add capacity (heat loss is higher)
- Leaky ducts or poor airflow: can reduce delivered heat to rooms
What that means for 90,000 BTU
(Estimated area = 90,000 ÷ BTU per sq ft)
| Home heat-loss level | BTU per sq ft | Estimated coverage for 90,000 BTU |
|---|---|---|
| Low (tight, well insulated) | 30 | ~3,000 sq ft |
| Medium (typical) | 40 | ~2,250 sq ft |
| High (drafty, cold climate) | 55 | ~1,635 sq ft |
Why the “right” answer depends on your home
Two homes with the same square footage can need very different furnace sizes. These factors drive the difference:
- Local winter design temperature (climate zone)
- Insulation levels in attic, walls, and basement/crawlspace
- Window type, age, and air leakage
- Ceiling height and open floor plans
- Duct sizing, duct leakage, and filter restriction
How we recommend sizing it (best practice)
A Manual J calculation is the standard way to match furnace output to your home’s heat loss. It helps prevent:
- Short cycling (oversized furnace)
- Uneven temperatures and comfort complaints
- Higher fuel use than expected
- Excess wear on ignition and blower components
Parts and model matching
When you’re shopping for replacement parts for your Coleman DGAT090BDD Evcon furnace, match parts by the full model number to avoid fit and wiring differences between similar units. You can also search by model number on Sears PartsDirect.
Last updated: February 2026
How much does it cost to replace a 60,000 BTU furnace?
Replacing a 60,000 BTU furnace typically costs about $3,500 to $8,500 installed in most U.S. homes. For a Coleman Evcon furnace like model DGAT090BDD, the final price depends on efficiency (AFUE), venting changes, and whether the job needs ductwork, gas-line, or electrical updates.
What drives the price most
These items usually move the total up or down the fastest:
- Furnace efficiency (AFUE): higher-efficiency units cost more and may require different venting
- Venting and combustion air: PVC vs metal venting, chimney liner needs, condensate drain routing
- Labor complexity: tight closet installs, attic installs, or code-required clearances
- Ductwork condition: resizing, sealing, or replacing damaged supply or return ducts
- Electrical and controls: new disconnect, wiring repairs, thermostat upgrades
- Permits and inspection: commonly included in professional replacement pricing
Typical cost ranges (installed)
| Scenario | What it usually includes | Typical total |
|---|---|---|
| Basic replacement | Like-for-like swap, minimal venting changes | $3,500 to $5,500 |
| Mid-range upgrade | Some venting/drain work, moderate labor | $5,500 to $7,000 |
| Complex install | Major venting changes, duct/electrical work | $7,000 to $8,500 |
Quick sizing and compatibility checks
A “60,000 BTU” furnace can be oversized or undersized depending on the home. Before you buy, we recommend confirming:
- Input BTU vs output BTU (output depends on AFUE)
- Cabinet size and orientation (upflow, downflow, horizontal)
- Venting type (standard vs condensing)
- Gas type (natural gas vs LP conversion requirements)
- Blower and duct static pressure compatibility
For parts lookup and model matching, start with the parts list for DGAT090BDD, or search by model on Sears PartsDirect.
Why it matters
A correctly sized, properly vented furnace runs safer, cycles less, and avoids comfort problems like hot and cold rooms. It also helps prevent premature wear on common furnace components such as the inducer motor, igniter, flame sensor, and blower.
Last updated: February 2026
What is the most common part to fail on a furnace?
On a Coleman Evcon furnace model DGAT090BDD, the most common “failure point” we see is the air filter becoming clogged (it is a maintenance item, but it stops heat just like a failed part). After that, frequent no-heat causes are a dirty flame sensor, a failed hot surface igniter, or a thermostat/power issue.
Most common culprits (in order)
- Air filter: Restricted airflow overheats the heat exchanger area and trips the high-limit safety.
- Flame sensor: Light oxidation or soot prevents flame proving; the control shuts the gas off.
- Hot surface igniter (HSI): Cracks or opens electrically; burners never light.
- Limit switch / rollout switch: Opens from overheating or flame rollout; furnace locks out.
- Inducer motor / pressure switch: Venting draft is not proven; ignition sequence stops.
- Control board or wiring: Loose spade connectors, damaged wires, or failed relays.
Quick checks you can do safely
- Set thermostat to HEAT, fan to AUTO, and raise setpoint 3 to 5 degrees.
- Check the furnace switch and breaker; confirm the furnace has power.
- Replace the air filter if it is dirty (a clogged filter is the top cause of short cycling and shutdowns).
- Look for a blinking LED fault code on the control board door panel (if equipped).
- If you smell gas, stop and have the system checked by a qualified technician.
Symptoms and what they usually point to
| What you notice | What it commonly means | What we do next |
|---|---|---|
| Blower runs, no heat | Flame not proven or ignition failed | Clean flame sensor; test igniter |
| Starts then shuts off in 5 to 30 seconds | Dirty flame sensor | Clean sensor; verify microamp signal |
| Runs 1 to 3 minutes then shuts off | Overheating | Replace filter; check vents and blower |
| Nothing happens | Power/thermostat/control issue | Verify 24 VAC call for heat; check fuse/wiring |
Why it matters
Most furnace “part failures” are actually safety shutdowns caused by airflow, flame-proving, or venting problems. Fixing the root cause (filter, sensor cleaning, venting) prevents repeat breakdowns and protects major components.
Parts and repair help
We list replacement parts by model so you can match the correct igniter, flame sensor, switches, and controls for DGAT090BDD; if you need to search more broadly by model number, use Sears PartsDirect.
Last updated: February 2026
Is it worth fixing a 20 year old furnace?
For a Coleman Evcon furnace like model DGAT090BDD, fixing a 20-year-old unit is worth it when the problem is a single, low-cost repair and the furnace has been reliable; repeated breakdowns or major component failures make replacement the better long-term value.
Repair vs. replace checklist
Use these checkpoints before paying for parts or labor:
- Repair history: More than one significant repair in the last 2 to 3 heating seasons points to replacement.
- Failure type: Small electrical issues (loose wire, fuse, door switch) are good repair candidates; major failures (blower motor, inducer, control board) usually are not.
- Performance: Short cycling, uneven heat, or long run times often signal a system in decline.
- Operating cost: Older furnaces typically have lower efficiency, so bills stay higher even after a repair.
- Downtime risk: If diagnosing the issue takes multiple visits, labor can exceed the value of the fix.
Common scenarios (what usually makes sense)
| Situation | Usually worth repairing? | Why it matters |
|---|---|---|
| Loose connection, blown fuse, tripped safety | Yes | Fast, low-cost fix |
| Dirty flame sensor, minor ignition issue | Often | Routine service restores heat |
| Intermittent no-heat calls all season | Usually no | Troubleshooting time adds up |
| Motor, inducer, or control failure | Usually no | High parts and labor; more failures follow |
Smart steps before you spend money
- Shut off power at the furnace switch or breaker.
- Confirm thermostat settings and batteries (if used).
- Check the air filter and return vents; restricted airflow can cause shutdowns.
- Inspect for loose spade connectors or damaged wiring.
- If you test electrical parts, follow safe meter practices; see how to use a multimeter to test electrical parts video.
Why it matters
At 20 years old, reliability and total cost (repair plus energy use) drive the decision more than the price of a single part.
To look up diagrams and search by model number, use the DGAT090BDD parts list first, then broaden your search on Sears PartsDirect.
Last updated: February 2026
