Does this have a hysteresis, or "swing" temp control?

It does not, but here is a work-around: Honeywell *does* have a control that sets the cycles per hour, this is called "Heating Cycle Rate" and is function #0240 on my Honeywell RTH7600D. The default for this is "5" cycles per hour, I set mine to "1". This has minimized annoying and inefficient cycling on my gas furnace. To make sure I knew exactly what was going on, I also turned off "Smart Response Technology", function #0530. I am not certain that the "Heating Cycle Rate" numbers correspond *exactly* to cycles per hour, but I believe that they are at least proportionate. Good luck!

Does this need a C wire or does it run on batteries?

This does not need a C wire. It uses two AA batteries. Honeywell (and others such as Trane) use a C wire on models that use WiFi or voice recognition or Z-wave so they can have a 24V connection. All thermostats use low voltage from the other connectors and typically use the batteries as a backup when there's no C wire. For this thermostat, you can take it off the wall, hold it in your hands and program it. You can't do that on models that don't use batteries. However, those other models can be programmed from a computer or phone app so it's less necessary.

Does it have a programmable fan?

Depends on your definition of 'programmable'. It can be set one of two ways: "On" - fan is always on, "Auto" - fan only runs when heat/cool is on. Those are the only fan settings.

Why would you buy this thermostat over the one that costs $26, also from Honeywell?

We bought as the same reason as below. For us, the Honeywell RTkH7600D offered the possibility of setting automatic individual heat/cool cycles or programs for each day of the week. The $26 one offers program settings for Monday-through-Friday (one set that applies to all of the 5 weekdays) and a second programmable sets for Saturday and Sunday. We wanted to be able to set different programs for EACH day of the week. I bought two of these and they work great.

Brand	Honeywell Home
Model Name	RTH7600D
Product Dimensions	1.25"D x 6"W x 3.75"H
Controller Type	Touch
Special Feature	Smart Response Technology, Touchscreen
Color	White
Specific Uses For Product	Furnace
Temperature Control Type	Heating and Cooling
Connectivity Technology	Wired
Included Components	Thermostat, Mounting Hardware, Quick Install Guide
Power Source	Battery Powered
Item Weight	0.55 Pounds
Voltage	24 Volts
Material	Plastic
Display Type	Digital
Screen Size	15.24 Centimeters
Control Type	Touch
Control Method	Touch
Connectivity Protocol	BACnet MS/TP
Mounting Type	Wall Mount
Style	Thermostat
Backlight	Yes
UPC	085267115216
Global Trade Identification Number	00085267115216
Manufacturer	Honeywell Home
Part Number	RTH7600D1030
Item Weight	8.8 ounces
Item model number	RTH7600D
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Special Features	Smart Response Technology, Touchscreen
Batteries Included?	No
Batteries Required?	No
Battery Cell Type	Alkaline
Warranty Description	1 year warranty.

Honeywell Home RTH7600D 7-Day Programmable Touchscreen Thermostat, White

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