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Honeywell TH4110D1007 PRO 4000 5+2 Day Programmable Thermostat

The Honeywell PRO 4000 is a programmable digital thermostat from Honeywell that can be installed in your home to provide basic comfort control with the added benefit of energy savings. Also known as part number TH4110D1007. The Honeywell TH4110D1007 differs from the Honeywell TH4210D1005 in that it has only one heat stage, whereas the TH4210D1005 has two heat stages. Both of these model numbers, however, are Honeywell PRO 4000 Thermostats. The PRO-4000 Programmable Thermostat Features: Digital Backlit Display - easy to read in any lighting condition Basic Operation - easy to use interface Precise Comfort Control - high level of accuracy (+/- 1 degree F) Built-In Instructions Weekday/Weekend Programming - 5-2 programming to fit your lifestyle Energy Star Compliant One of the key features of the PRO4000 Thermostat is the programming feature. Programming the temperature in your home to fit your needs is not only energy efficient but it saves you money! Going on a trip over the weekend? Program your thermostat to turn on the day before you get back and walk into your comfortable energy efficient home! If used as directed this programmable thermostat can save you up to 33% on annual heating and cooling costs. The PRO 4000 can be used to replace the following models: Honeywell : T8112 White-Rodgers : 1F78-151 Robertshaw : 8600, 9600 Totaline : P474-1035The Honeywell PRO 4000, TH411OD1007 Specifications: Dimensions: 3 3/16" x 5 3/8" x 1 1/4" Setting Temp Range (Fahrenheit) : 40 to 90 heat ; 50 to 99 cool Display Size: 1.32 Stages: 1 Heat / 1 Cool Application: Oil, Gas, Electrical or Heat PumpThe PRO4000 is backed by a 5-Year Limited Warranty and comes complete with operating manual, batteries, and thermostat.

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Nominal Vs. Actual Sizes: Finding the Right Air Filter Size

Buying the Correct Size Air Filter- The Most Important Thing to Know 

When you are buying your air filter online most important thing to know is Air Filters have two sizes that you need to understand the Nominal size and the Actual Size. Not understanding these numbers often leads to consumers purchasing a filter that does not fit their Furnace or HVAC system.

Nominal vs Actual air filter size by Atomic


Understanding Nominal Filters Size Could Save You Time and Money

Not understanding the Nominal Filter Size is the primary culprit for incorrectly purchased filters.The Nominal Size is the usually the dimensions used to Label the filter. For instance 16x20x1. These dimensions are a rounded value on the filters actual measurements. The actual measurements on this filter may be 15.5x19.5x.75, but that could vary by brand and manufacturer. So in order to make sure you have the correct size filter, especially if you are replacing with a different brand it is important to confirm the actual size on the filter. When purchasing filters on the internet the Nominal size is usually found in the product title.

Actual Filter Size- The Key to Making the Right Replacement Filter Purchase

The actual size as you might have guessed are the actual dimensions of the filter by length, width and thickness. This size is often on the filter right below the Nominal size and is usually labeled as the actual size. When you are buying a filter online the actual size is sometime in the product bullet point or the product description. If your filter does not have actual dimensions on the outside of the filter, you can measure you filter to get the correct dimensions. Some brands have a foam gasket on the outside of the filter, in this case, you will want to make sure you have a compatible actual size and that it also has the foam to ensure a snug fit. 

Lennox Air Filter X0851 with Foam strips

Examples of Nominal and Actual Sizes

 Size  Example 1  Example 2
Nominal Size 20x20x1 16x20x1
Actual Size 19.5x19.5x.75 15.75x19.75x.75


 Furnace filters should fit securely but should not have to be forced into position. If you have to force the filter into its slot, then it is probably too big. Forcing an improper filter size in a filter can cause it to buckle, damaging the filter or reducing its ability to function properly. Filters are a smaller than their slot to allow for easy replacement. Some HVAC units may need a filter with dimensions that are unique or uncommon. In these cases, a custom filter needs to be ordered.

Find Your Filter Sizes Easy in 1" Deep Filters , 2" Deep Filters, 4" Deep Filters

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