CARRIER 20-11-9451 Roof Racks Bars
fits model: Cross.
( Brand: Carrier ), ( Manufacturer Part Number: 20-11-9451 ), ( Part Type: Rack Bar )
Review CARRIER fits CROSS
The **Carrier 20-11-9451** is a high-performance, variable-speed rooftop unit (RTU) designed to deliver exceptional climate control for medium to large commercial and industrial spaces. Engineered with Carrier s renowned efficiency and reliability, this unit combines advanced refrigeration and heating technologies to maintain precise indoor environmental conditions while optimizing energy consumption. The 20-11-9451 features a robust **variable-speed compressor**, allowing for seamless modulation of cooling and heating output to match real-time load demands, reducing wear on the system and lowering operational costs. Its **copper tube and aluminum fin heat exchanger** ensures superior heat transfer efficiency, while the **electronic expansion valve (EEV)** enhances dehumidification performance, making it ideal for spaces requiring strict humidity control, such as data centers, laboratories, or manufacturing facilities.
This RTU is equipped with **Carrier s Infinity scroll compressor technology**, which delivers smooth, quiet operation and extended component life by minimizing thermal cycling. The unit s **modular design** allows for easy installation and maintenance, with components like the fan, filter, and controls accessible without extensive disassembly. The **integrated variable-speed fan motor** adjusts airflow dynamically, further improving energy savings and occupant comfort. For enhanced durability, the 20-11-9451 is constructed with **galvanized steel construction**, corrosion-resistant materials, and a **sound-rated enclosure** to minimize noise intrusion in sensitive environments. Additionally, its **compatibility with Carrier s iQ technology** enables advanced building automation integration, allowing for remote monitoring, predictive maintenance, and energy optimization through smart controls.
Suitable for applications ranging from office buildings and retail spaces to healthcare facilities and industrial warehouses, the 20-11-9451 offers **high-efficiency operation** with SEER ratings up to **20** and HSPF ratings up to **12**, ensuring compliance with modern energy codes while maximizing performance. Its **dual-stage filtration system** captures airborne particles, allergens, and contaminants, promoting healthier indoor air quality, while the **adjustable louvers** provide flexible airflow distribution to accommodate various ductwork configurations. Whether deployed in new construction or as a replacement for outdated systems, this Carrier RTU delivers a balance of performance, reliability, and energy efficiency, making it a smart investment for building owners and facility managers seeking long-term sustainability and comfort.
### **Pros and Cons of buying a Carrier 20-11-9451 (Air Conditioner Unit)**
The **Carrier 20-11-9451** is a **20-ton rooftop air conditioning unit**, commonly used in commercial and industrial applications. Below is a detailed analysis of its advantages and disadvantages.
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### **Pros**
1. **High Capacity for Large Spaces**
- The 20-ton cooling capacity makes it suitable for large commercial buildings, warehouses, factories, or multi-room facilities where significant cooling is required. It can efficiently handle high heat loads without frequent cycling.
2. **Energy Efficiency (Depending on Model Year & Configuration)**
- Carrier units are generally designed with energy-efficient compressors and variable-speed technology in newer models. If this unit is well-maintained and equipped with modern components (such as a **scroll compressor** or **inverter-driven system**), it can reduce energy consumption compared to older, fixed-speed units.
3. **Durability & Reliability**
- Carrier is a well-established brand with a reputation for durable construction. If the unit is properly maintained, it can last **15 25 years**, especially in moderate climates. The rooftop design also protects internal components from dust and debris better than some indoor systems.
4. **Modular & Expandable Design**
- Many Carrier rooftop units allow for **add-on components** such as additional cooling stages, heating coils, or humidity control. This flexibility makes it easier to adapt to changing cooling demands without replacing the entire unit.
5. **Lower Operating Costs (If Well-Maintained)**
- A properly tuned and serviced Carrier unit can operate more efficiently than poorly maintained or older systems. Regular maintenance (cleaning coils, checking refrigerant levels, lubricating fans) helps sustain performance.
6. **Good for Humidity Control**
- Carrier units often include **dehumidification features**, which can be beneficial in hot, humid climates where excessive moisture is a concern.
7. **Ease of Installation & Maintenance**
- Being a **rooftop unit**, it avoids the need for extensive ductwork modifications inside the building. Maintenance access is typically easier compared to split systems or packaged terminals.
8. **Compatibility with Advanced Controls**
- Many Carrier units integrate with **building automation systems (BAS)** or smart thermostats, allowing for better energy management and remote monitoring.
9. **Resale Value & Market Demand**
- Carrier is a trusted brand, so a well-documented unit may hold better resale value than lesser-known brands. There is also a **larger pool of technicians** familiar with Carrier systems, which can be useful for repairs.
10. **Quiet Operation (Compared to Some Alternatives)**
- Modern Carrier units are designed to minimize noise, making them more suitable for spaces where sound levels are a concern (e.g., offices, retail stores).
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### **Cons**
1. **High Upfront Cost**
- A **20-ton Carrier rooftop unit** is a **significant investment**, often costing **$15,000 $30,000 ** depending on age, condition, and included features. Used units may be cheaper but could come with hidden issues.
2. **Age & Potential Wear & Tear**
- If the unit is **older (15 years)**, it may have **worn-out compressors, seals, or electrical components**, leading to frequent breakdowns. Carrier units from the **1990s (like this model)** may not have the same efficiency as newer **SEER-rated** or **variable-speed** models.
3. **Energy Inefficiency Compared to Modern Units**
- Older Carrier models (pre-2000s) often lack **high-efficiency compressors, variable-speed fans, or smart controls**, leading to **higher electricity bills** compared to newer **ENERGY STAR-rated** units. If this unit operates in a **hot climate**, inefficiency can become costly.
4. **Refrigerant Compatibility Issues**
- Older Carrier units may use **R-22 (Freon)**, which is **banned in new installations** due to environmental regulations. If the unit still uses R-22, **refrigerant leaks or replacements will be expensive** (R-22 is no longer manufactured in the U.S.). Transitioning to **R-410A (Puron)** may require **major modifications**, increasing costs.
5. **High Maintenance Requirements**
- Rooftop units are exposed to **dust, rain, and extreme temperatures**, leading to:- **Frequent coil cleaning** (clogged coils reduce efficiency).
- **Fan motor failures** (due to dust buildup).
- **Electrical component wear** (relays, capacitors, control boards).
- If maintenance is neglected, **repair costs can add up quickly**.
6. **Limited Warranty Coverage**
- Used Carrier units (especially those from the **1990s**) may have **expired warranties** or **limited coverage**. Even if some warranty remains, **labor costs for repairs** can be high.
7. **Noise & Vibration Concerns**
- Older Carrier units may produce **more noise and vibration** than newer, better-balanced models. This can be problematic in **quiet environments** (e.g., hospitals, libraries, offices).
8. **Ductwork & Air Distribution Issues**
- If the ductwork is **poorly designed or leaky**, the unit s efficiency will suffer. Older buildings may have **inadequate duct sizing**, leading to **uneven cooling** or **energy waste**.
9. **Potential for Hidden Problems**
- When buying a used unit, common issues include:- **Leaking refrigerant** (visible oil stains under the unit).
- **Faulty compressors or capacitors** (common in high-hour units).
- **Corroded electrical connections** (due to moisture exposure).
- **Worn-out belts or bearings** (leading to fan motor failure).
- A **thorough inspection by an HVAC technician** is **essential** before purchase.
10. **Limited Availability of Parts**
- While Carrier is a well-known brand, **older models (like the 20-11-9451) may have discontinued parts**, making repairs more difficult and expensive.
11. **Installation & Permitting Challenges**
- Rooftop units require **proper structural support, electrical upgrades, and ventilation**. If the building s rooftop is **not designed for heavy equipment**, additional **reinforcement may be needed**, increasing costs.
12. **Potential for Higher Operating Costs in Extreme Climates**
- In **very hot or very cold regions**, an older Carrier unit may struggle to maintain efficiency, leading to **higher energy bills** and **more frequent breakdowns**.
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### **Ending Conclusion**
The **Carrier 20-11-9451** is a **reliable, high-capacity air conditioning unit** that remains a **good choice for large commercial spaces** where durability and cooling power are priorities. However, its **age (1994 model) introduces several drawbacks**, particularly in terms of **energy efficiency, refrigerant compatibility, and maintenance costs**.
**If you are considering this unit, weigh the following:**- **Pros:** Strong cooling capacity, brand reputation, potential for long-term reliability if well-maintained.
- **Cons:** Likely **high energy costs**, **R-22 refrigerant issues**, **higher maintenance needs**, and **possible hidden mechanical problems**.
**For most modern applications, a newer Carrier unit (with **SEER 16 rating, variable-speed compressors, and R-410A refrigerant**) would be a **better long-term investment**, offering **lower operating costs and better efficiency**. However, if budget is a constraint and the unit is **in excellent condition with full service records**, it can still be a **viable option** especially if the building s cooling demands justify its size.
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### **Recommendation**
1. **If You Must Buy This Unit:**- **Get a full HVAC inspection** by a **licensed technician** before purchasing.
- **Verify refrigerant type** if it s R-22, factor in **replacement costs** (R-410A conversion may be expensive).
- **Check maintenance records** a well-documented unit with **regular servicing** will be more reliable.
- **Compare repair vs. replacement costs** if the unit is **15 years old with frequent breakdowns**, it may be cheaper to **upgrade to a newer, more efficient model**.
- **Consider upgrading to a variable-speed model** if possible, as it will **reduce energy costs** in the long run.
2. **If Possible, Consider a Newer Alternative:** - **Carrier s newer rooftop units (e.g., Infinity, Ultra) offer:**- **Higher SEER ratings (16 23 )** for better efficiency.
- **Variable-speed compressors** for smoother operation and lower energy use.
- **R-410A or R-32 refrigerant** (no phase-out issues).
- **Smart controls & IoT integration** for better energy management.
- **While the upfront cost is higher, the **savings on energy bills and lower maintenance costs** often justify the investment over time.**
3. **If Budget is Extremely Limited:**- **Look for a well-maintained used Carrier unit from the last 10 years** (
Details:
Carrier 20-11-9451: Part Number: Manufacturer. Manufactured following strict OE standards to work like the original component. Designed specifically for trucks, trailers, and buses. Made of high-quality components for durability, reliability, and performance.
Engineered with a factory-like design for effortless installation, ensuring perfect match your vehicle. Engineered using the latest technology to ensure product lasts longer in service.
part #: 20119451 prices
- $619.21-$1033.68
specifications azcarracks:
- for models: Cross
- brand: Carrier
- mpn: 20-11-9451
- part type: Rack Bar
payments azcarracks:
- other
- wallet: Paypal
- credit card: Diners-club
returns azcarracks:
- paid by: Seller
- policy: Returns Accepted
- time: 30 Days
offer azcarracks:
- quantity: 1
- started: February 1, 2026
- sold: 0
- options: Ship-to-home
- best offers: True
- availability: In Stock
seller azcarracks:
- # reviews: 64077
- rating: 99.1%
- city: Los Angeles, California
general azcarracks:
- condition: New
- Car Truck Parts Accessories > Racks Cargo Carriers > Roof Racks Cross Bars
shipping azcarracks:
- transit: 3-6 Days
- cost: $0.00
- service: Standard
- type: Fixed
- class: Standard
