Specifying a 10-Ton Rooftop Unit: Comparing the Workhorse Size Across Brands
Ten tons, nominally 120,000 Btu/h of cooling, is one of the most common rooftop unit sizes in light commercial work. It shows up on strip-center anchors, restaurants, churches, schools, medical offices and warehouse office areas, and it is the size where you have the most choices in this Commercial Rooftop Units section. This page carries Daikin, Rheem and Comfortstar units in gas/electric, heat pump and cooling-only configurations, so the job here is less about finding a unit and more about comparing them fairly.
The guide below is organized the way a good submittal review goes: rated capacity, heat, electrical, efficiency, airflow and controls, then the physical and logistics items that decide how the install day goes.
Start With Rated Capacity, Not the Tonnage Label
Units sold as 10 tons do not all deliver the same capacity. The listed cooling capacities on this page run from about 114,000 Btu/h on the Rheem and Comfortstar units to about 116,000 Btu/h on the Daikin R-32 units, with the Daikin DFG listing at 120,000 Btu/h. A difference of a couple thousand Btu/h rarely decides a job, but on a tight load or a hot-climate replacement it can. Pull the manufacturer's expanded performance data at your outdoor design temperature and actual airflow, and compare sensible capacity as well as total, since sensible capacity is what holds the space temperature.
As for applications, a 10-ton unit typically serves a single large zone or a group of rooms on one thermostat. Rules of thumb based on square footage vary so widely by building type that they are useful only to sanity-check a calculation; a dense assembly space can need several times the capacity of a lightly occupied storage area of the same size. If the calculation comes in below about 105,000 Btu/h, look at the 8.5 Ton Rooftop Units page; if it runs well past 120,000, the 12.5 Ton Rooftop Units page is next.
Heat Source and Heat Input
- Gas/electric: Daikin DSG (standard efficiency) and DHG (high efficiency) are listed at 130,000, 180,000 and 240,000 Btu/h gas input at this size. Rheem RGEDYB is listed at 150,000 Btu/h input. Daikin DFG gas/electric units are also listed.
- Heat pump: Daikin DSH (208/230V, 460V, 575V) and Rheem RHPDYB (208/230V).
- Cooling only: Daikin DSC and DHC, Rheem RACDYB, and the Comfortstar Freedom CRT7.
The 240,000 Btu/h Daikin option is a step up from the 225,000 Btu/h top input at the 7.5 and 8.5-ton sizes, which is useful for cold-climate buildings or spaces with high outside-air requirements. For most buildings in warm climates, the lowest heat input is adequate; picking a larger burner than needed only adds cost and short heating cycles. Base the choice on the heating load including ventilation, and check the temperature rise range on the product page against your design airflow.
Electrical Service
All 10-ton units here are three-phase. Daikin offers 208/230V, 460V and 575V across its R-32 series. Rheem offers 208/230V and 460V on the RGEDYB and RACDYB listings, with the RHPDYB heat pump listed in 208/230V. The Comfortstar CRT7 is listed in 208/230V. When comparing brands at 208/230V, compare the nameplate MCA and MOP on each listing, not just the voltage; a lower MCA can mean a smaller conductor and breaker, which adds up on long rooftop runs and on buildings with limited panel capacity.
Efficiency Side by Side
For equipment of this size, EER and IEER are the comparison metrics. On this page the Daikin high-efficiency DHG and DHC lead at 17 IEER and 12 EER. The Daikin DSG, DSC and DSH standard-efficiency units are listed at 15.2 IEER and 11 EER (one DSG variant is listed at 14.8 IEER). Daikin DFG is listed at 14.8 IEER. Rheem RGEDYB lists 14.6 IEER, RHPDYB 14.1 IEER, and RACDYB is listed both as a Renaissance Classic unit at 11.2 EER and as a 14.8 IEER model. The Comfortstar CRT7 lists 11.2 EER.
IEER matters most for operating cost, since it weights part-load performance, where a rooftop unit spends most of its hours. If a project requires a minimum efficiency for code compliance, a utility incentive or a green building program, confirm the AHRI certificate for the exact model number, including factory options, because some options change the certified rating.
Compressors, Staging and Airflow
The Daikin 10-ton listings show two compressors, giving two steps of capacity. The Rheem 10-ton listings show two-stage compressor operation and a belt-drive blower with a VFD, which lets the indoor fan slow at low stage and can make it simpler to meet variable or multi-speed fan requirements in current energy codes. The Comfortstar CRT7 lists two compressors. For retrofits into existing ductwork, compare the maximum external static pressure and blower options on each product page. Older ductwork on 10-ton jobs is often undersized, and a direct-drive blower that cannot overcome the static will leave you short on airflow.
Refrigerant: Daikin R-32, Rheem and Comfortstar R-454B
The current-production units here use A2L refrigerants: R-32 in Daikin's DSG, DHG, DSC, DHC and DSH, and R-454B in the Rheem and Comfortstar units. Plan for A2L-rated recovery and evacuation equipment, technician training on A2L handling, and installation per the manufacturer's manual and adopted mechanical code. Many A2L packaged units include a factory leak detection sensor that commands the blower on a leak; keep that sensor connected. The Daikin DFG listings use R-410A; new R-410A packaged equipment is no longer being manufactured for this application, so confirm availability and project acceptance before ordering.
Curbs and Physical Fit
Listed weights at this size run from about 870 lb for the Rheem heat pump to about 1,300 lb for the Daikin DHG gas/electric unit. That spread matters for retrofit. If you are swapping a unit of one brand for another, plan for an adapter curb or new curb, and check whether the new unit is heavier than the roof framing was designed for. Compare cabinet dimensions on the product pages against the existing curb, clearances to parapets and roof edges, and the service-side clearance needed for the compressor and control compartments.
Economizer and Ventilation Requirements
At 10 tons, many jurisdictions require an air-side economizer depending on climate zone and the adopted ASHRAE 90.1 or IECC edition, and some also require fault detection and diagnostics on the economizer. Demand-controlled ventilation may also come into play for high-occupancy spaces. These are code questions for the engineer of record or the plan reviewer. Once you know the requirement, order the economizer that is designed for that specific cabinet, along with the barometric relief or power exhaust if the building pressure calls for it.
Submittal Checklist Before You Order
- Confirm the full model number, which encodes efficiency tier, heat input and voltage.
- Match MCA and MOP to the existing circuit or the new design.
- Choose curb or adapter curb and confirm it is in the same order.
- Confirm economizer, controls and smoke detector requirements.
- Check lead time; 460V, 575V and high-heat units do not always stock as deep as common 208/230V units.
- Book the crane only after delivery is confirmed.
10-Ton Models in This Category
| Brand | Series | Type | Voltages Listed | Efficiency (as listed) |
|---|
| Daikin | DHG | Gas/electric, R-32, high efficiency | 208/230V-3, 460V-3, 575V-3 | 17 IEER, 12 EER |
| Daikin | DHC | Cooling only, R-32, high efficiency | 208/230V-3, 460V-3, 575V-3 | 17 IEER, 12 EER |
| Daikin | DSG | Gas/electric, R-32, standard efficiency | 208/230V-3, 460V-3, 575V-3 | 15.2 IEER (one variant 14.8), 11 EER |
| Daikin | DSC | Cooling only, R-32, standard efficiency | 208/230V-3, 460V-3, 575V-3 | 15.2 IEER, 11 EER |
| Daikin | DSH | Heat pump, R-32 | 208/230V-3, 460V-3, 575V-3 | 15.2 IEER, 11 EER |
| Daikin | DFG | Gas/electric, R-410A | 208/230V-3, 460V-3, 575V-3 | 14.8 IEER |
| Rheem | RGEDYB | Gas/electric, R-454B, belt drive VFD | 208/230V-3, 460V-3 | 14.6 IEER, 11 EER |
| Rheem | RHPDYB | Heat pump, R-454B, belt drive VFD | 208/230V-3 | 14.1 IEER, 11 EER |
| Rheem | RACDYB | Cooling only, R-454B, belt drive VFD | 208/230V-3, 460V-3 | 11.2 EER (Renaissance Classic); 14.8 IEER model also listed |
| Comfortstar | Freedom CRT7 | Cooling only, R-454B | 208/230V-3 | 11.2 EER |
Figures are from each product listing; confirm against the manufacturer's spec sheet or AHRI certificate for the exact model before submitting.
Frequently Asked Questions
Why do 10-ton units list 114,000 to 116,000 Btu/h instead of 120,000?
Nominal tonnage is a size class. Rated capacity is measured at standard test conditions and is often a bit below the nominal figure. Size the unit on its rated and expanded performance data, not the label.
What is the largest gas heat input available at 10 tons here?
The Daikin DSG and DHG listings offer up to 240,000 Btu/h input, with 130,000 and 180,000 Btu/h options as well. The Rheem RGEDYB listing shows 150,000 Btu/h.
Which 10-ton units come with a VFD on the blower?
The Rheem RGEDYB, RHPDYB and RACDYB listings on this page describe a belt-drive blower with a VFD. For other models, check the blower motor type on the product page.
Can I mix brands on the same roof?
Yes, but each brand needs its own curbs, accessories and service parts, and controls integration may differ. Many owners standardize on one brand to simplify service stock.
Is there a 10-ton packaged heat pump in 460V?
Yes. The Daikin DSH is listed in 208/230V, 460V and 575V. The Rheem RHPDYB on this page is listed in 208/230V.
Should I pick high efficiency or standard efficiency?
It depends on run hours, electric rates and any incentive available. A long-hour building in a hot climate usually justifies the Daikin DHG or DHC; a lightly used space may not. Run the numbers for the specific site.
