Clothes DryersHeat Pump
Summit LDHP24 Clothes Dryer Manual
Setup, everyday use, maintenance and troubleshooting for the 4.2 cu. ft. compact heat-pump dryer, with verified specifications.
- Capacity4.2 cu. ft.
- TypeElectric, ventless
- CEF3 lb/kWh
- Est. yearly cost$48.11
About the Summit LDHP24
This guide covers the Summit LDHP24, a 4.2 cu. ft. compact heat-pump dryer listed as ENERGY STAR certified. It measures 23.5 in. wide, 33.5 in. high, and 25.5 in. deep.
A heat-pump dryer recirculates warm air through a refrigeration circuit that condenses moisture out of it, rather than exhausting hot air outdoors. It dries at lower temperatures — gentler on fabrics — and uses much less energy, though cycles take longer.
Listed features include wrinkle prevention and a filter-cleaning reminder.
Its combined energy factor (CEF) is 3 lb of clothes per kWh, for an estimated 283 kWh per year.
Specifications
| Brand | Summit |
|---|---|
| Model number | LDHP24 |
| Dryer type | Heat Pump |
| Fuel | Electric |
| Venting | Ventless |
| Heat-pump technology | Heat Pump |
| Drum capacity | 4.2 cu. ft. |
| Width | 23.5 in. |
| Height | 33.5 in. |
| Depth | 25.5 in. |
| Voltage | 240 V |
| Combined energy factor (CEF) | 3.00 lb/kWh |
| Estimated annual energy use | 283 kWh/yr |
| Energy test cycle time | 78 min |
| Energy test cycle settings | Cotton normal, Extra dry ++ |
| Listed features | Filter cleaning indicator, Drum light, Wrinkle prevention option, Time remaining display, Condensed water tank indicator, Child lock |
| Smart / connected features | No |
| Paired ENERGY STAR washer available | Yes |
| ENERGY STAR Most Efficient | No |
Safety information
- Clean the lint filter before or after every load. Lint buildup restricts airflow, lengthens drying time and is a leading cause of dryer fires.
- Never dry items soiled with gasoline, solvents, cooking or massage oils, or other flammable substances — even after washing, residual oil can ignite. Do not dry foam rubber or rubber-backed items.
- Check inside the drum before every cycle; children and pets can climb in. Do not let children play on or in the dryer.
- Keep the area around the dryer free of lint, dust, paper and flammable products.
- Connect the dryer to a dedicated 240 V circuit as specified on the rating plate, with the power cord kit that matches your outlet (four-wire in new construction) or hard-wired as the instructions allow. Have a qualified electrician make the connection.
Installation and first-time setup
This model is 23.5 in. wide, 33.5 in. high, and 25.5 in. deep according to the certification data. Add room behind it for the power cord and drain hose, and in front for the door to open fully.
- Choose the location
Pick a level floor in a room that stays within the temperature range given in the manual. Ventless dryers release some warm air into the room, so a closet installation needs the ventilation openings the instructions specify.
- Connect the power
Connect the dryer to a dedicated 240 V circuit as specified on the rating plate, with the power cord kit that matches your outlet (four-wire in new construction) or hard-wired as the instructions allow. Have a qualified electrician make the connection.
- Set up condensate removal
Route the drain hose to a standpipe, laundry tub or the washer drain as the instructions describe, or leave the water container in place and plan to empty it after every load.
- Level the dryer
Adjust the legs until the dryer is level side to side and front to back; a level drum tumbles evenly and runs quietly.
- Stacking (optional)
If stacking on a washer, use only the manufacturer's stacking kit for your washer and dryer models.
- Test run
Run a timed cycle with a few damp towels. Confirm that it heats and the drum turns smoothly, and that water drains or collects as expected.
Using your dryer
Loading
The 4.2 cu. ft. drum is sized for smaller loads — dry bulky items one at a time. Fill it loosely — clothes need room to tumble — and dry similar fabrics together so everything finishes at the same time. Clean the lint filter first.
Choosing a cycle
- Use automatic (sensor) cycles rather than timed drying whenever possible; they stop when clothes are dry instead of running a fixed time.
- Choose a lower heat setting for synthetics, activewear and delicates. Overdrying shrinks fabrics, sets wrinkles and wastes energy.
- Dry loads back to back so the dryer starts warm.
- The certified efficiency was measured on these settings: Cotton normal, Extra dry ++, with a test cycle of about 78 minutes. Using the same settings gives you results closest to the rating.
- Wrinkle prevention tumbles clothes periodically after the cycle ends if you cannot unload right away.
Living with a heat-pump dryer
- Expect longer cycles than with a vented dryer. Clothes also come out cooler, which can make them feel damp even when they are dry — check them after they have cooled for a minute.
- Clean the lint filter after every load and the secondary filter or condenser as often as the manual directs; ventless designs are very sensitive to lint.
- If the dryer collects water in a container rather than draining, empty it after every load.
- Run the washer's highest safe spin speed so less water reaches the dryer.
Care and maintenance
| When | What to do |
|---|---|
| Every load | Clean the lint filter. Empty the water container if your model collects condensate. |
| Every month | Check whether water pools on the lint screen when you run tap water over it. If it does, wash the screen in warm, soapy water with a soft brush — dryer-sheet residue clogs the mesh. |
| Every 3 months | Wipe the moisture-sensor strips inside the drum (usually near the lint filter) with a soft cloth; residue makes the dryer stop too early or run too long. |
| As the manual directs | Clean the secondary filter, heat exchanger or condenser. On models with a removable condenser, rinse it under running water; on heat-pump models, follow the manual — fins can be easily damaged. |
| As needed | Remove ink, crayon or gum residue from the drum with a damp cloth and mild cleaner, then tumble a load of old rags to pick up anything left. |
Troubleshooting
Most dryer problems come back to airflow. Work through the checks below before calling for service; if the display shows a code, look it up in the code table in your manufacturer's manual.
| Problem | Possible cause | What to try |
|---|---|---|
| Takes too long to dry | Clogged lint filter or condenser; overloading; clothes very wet from the washer; full water container. | Clean all filters, dry smaller loads, use a higher washer spin speed and empty or check the drain. |
| No heat | One leg of the double breaker tripped; heat cut out by a safety device after restricted airflow. (Heat-pump dryers run cooler by design.) | Reset the breaker fully off and on. If the drum turns but never heats, clean the lint path and call a technician. |
| Will not start | Door not fully closed; Start not held long enough; control lock on; tripped breaker or unplugged. | Close the door firmly, press and hold Start, turn off the lock and check the power supply. |
| Clothes too hot or shrinking | Heat setting too high; timed cycle too long; restricted airflow. | Use sensor cycles and a lower heat setting; clean the lint path. |
| Thumping, rattling or squealing | Coins, zippers or shoes in the drum; worn drum rollers, belt or glides. | Check pockets and the drum. Persistent squealing or thumping from an empty drum needs service. |
| Burning smell | Normal for the first uses of a new dryer; lint buildup near the heat source. | A faint smell during the first few loads is normal. Otherwise stop the dryer, clean the lint filter and housing, and call a technician if the smell continues. |
| Clothes wrinkled | Overloading; clothes left in the drum after the cycle. | Dry smaller loads, remove clothes promptly, or use the wrinkle-prevention option. |
| Water on the floor or container-full alert | Water container full or not seated; drain hose kinked or out of the standpipe. | Empty and reseat the container; check the drain hose routing. |
Energy use and running costs
The Summit LDHP24 is estimated to use 283 kWh per year under the U.S. Department of Energy test procedure, which assumes 283 drying cycles a year. At $0.17 per kWh, that is about $48.11 per year, or $0.17 per load.
CEF (combined energy factor) is the number of pounds of clothes dried per kWh of energy, including standby power; higher is better. This model's CEF of 3 lb/kWh is the figure behind the annual estimate. Its annual energy use is lower than 19% of comparable models in our database.
Heat-pump drying reuses the heat in the drum air instead of venting it, which is why heat-pump models post the highest CEF ratings. They also avoid pushing heated or cooled room air outdoors through a vent.
To lower costs further: use sensor-dry cycles, spin clothes at the washer's highest safe speed, keep the lint filter and vent clean, and dry full (but not overstuffed) loads back to back.
Frequently asked questions
What is the drum capacity of the Summit LDHP24?
The Summit LDHP24 has a 4.2 cubic-foot drum in a cabinet 23.5 in. wide.
Does the Summit LDHP24 need an outside vent?
No. It is a ventless heat-pump design: moisture is condensed into water that drains away or collects in a container, so no exhaust duct is needed.
Is the Summit LDHP24 gas or electric?
It is electric, listed at 240 V. It needs a dedicated 240 V circuit.
How much does it cost to run the Summit LDHP24?
It is rated at 283 kWh per year, about $48.11 a year at $0.17/kWh over 283 loads.
What is the CEF rating of the Summit LDHP24?
Its combined energy factor is 3 lb/kWh — the pounds of clothes it dries per kWh of energy. Higher numbers mean a more efficient dryer.
Is there a matching ENERGY STAR washer for the Summit LDHP24?
Yes. The certification record indicates that a paired ENERGY STAR certified clothes washer is available.
Is the Summit LDHP24 ENERGY STAR certified?
Yes. It appears on the ENERGY STAR certified clothes dryers list, with a certification date of January 2021.
Sources and disclaimer
Specifications on this page come from the ENERGY STAR certified clothes dryers dataset published by the U.S. Environmental Protection Agency (record certified January 20, 2021), retrieved October 7, 2026.
The setup, operating, maintenance and troubleshooting guidance is written by ManualHarbor's editors for this specific product type and configuration. It is an independent guide — not a reproduction of the manufacturer's manual — and ManualHarbor is not affiliated with Summit. Always follow the safety instructions, installation requirements and warranty terms supplied with your unit, and contact Summit or an authorized service provider for warranty repairs and replacement parts.
Running-cost figures use assumed U.S. average utility prices and are estimates for comparison only. See our editorial methodology for details.
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