yes , a thermostat ,digital, with the option of 2-stage cooling sub - base would do what you want . most likely a honeywell or Johnson controls brand.
edit this would require a professional to wire as the units both supp;y their own control power and a 2-stage theremostat has aprrox a 2 degree spread on the stages which would cause 1 unit to start then the second when it gets 2 degrees warmer
the best solution would be to use a single stage stat and have the professional upgrade the transformer in 1 unit to a higher VA then use relays to start both units together ( i would also use a small time delay in 2nd unit about 1 min to prevent high voltage spikes on start up)
I have used the contactor contacts of the first unit to power a relay that would energize the contactor (or the transformer) of the second unit. The relay coil voltage could be 120v or 240v and you avoid the larger transformer issues (they are $$$). Yes, you could just energize the second contactor, but the relay allows better flexilbilty on the coil voltage(s) choice.
I would ask myself this: If your house is large enough for 2 separate A/C units, why would you want to control a second space by the temperature in another part of the house? Each unit should have it`s own thermostat located in the space that it serves. By doing what you are asking about you are not only inviting comfort issues but also wasteful usage of your energy dollars.
Here's why: Many two story houses have separate heating and A/C systems for upstairs and downstairs. In Texas where I live, it may be 90 degrees one day and 40 the next. We flip the swith from heat to cool many, many times each year. Most of my family does not understand that both these units need to be switched together. If someone switches the upstairs unit to cool while the downstairs unit is on heat, I end up with a thermostatic blackhole that sucks my money in as fast as it can. Since cool air sinks and warm air rises, neither unit will ever shut off. I have been unable to find a thermostat that will control both units, but I will post here if I do. As it stands, I must run up (or down) the stairs everytime I change one of the thermostats to make sure I haven't created this horrible blackhole. I need to keep as much monay as I can.
Digital display thermostat battery(s) need replacing
The thermostat is non-programmable. So you cannot program it.
True (A+)
I would lean on saying it's a classicflame product. If it has Digital thermostat with numerical readout in the glass. This is there feature! Many of these furniture frames use interchangeable fire box by different companies (ie- 18" 23" ) Digital thermostat with numerical readout Digital thermostat with numerical readout
No.
Most digital thermometers use liquid crystal displays that cannot be repaired.
Digital thermostats can save an individual or family money over the course of a year, but only if used properly. If a person programs their thermostat correctly they can see substantial savings.
Remove the battery and check it with a volt meter.
You can program for 7 days
In a thermometer,thermostat,clock or oven You can refer to wikipedia.:)
yes
is a solution to a equation