Heating systems must be sized to be able to maintain a comfortable environment based upon a certain coldest day of the year. Because most colder days (those requiring heating to be comfortable) are not extreme, the heating system is oversized most of the year. Almost all heating systems operate at the same output BTU level regardless of the outdoor temperature when called upon to heat a structure. The TH-1 Thermostat Plus™ compensates for this "over-sizing" by controlling system "on" cycles relative to a sensed demand in a given day. This improves the delivery and usage efficiency in the overall structure being heated, resulting in reduced heating bills.

The operating principle is simple and proven and has a 12-year track record. By sensing what the demand based on the supply air temperature of a fully loaded heat exchanger the TH-1 Thermostat Plus™ adjusts the system's operating cycle to maximize the use of the energy that is delivered into the controlled space of the system. A more balanced exchange of energy requires more than wasteful reacting to temperature at the thermostat alone. That is why TH-1 is the Plus needed by your control system reducing waste and backed by a guaranteed energy savings of at least 20%.

Even the most advanced thermostats react to temperature along in the immediate environment. Thermostat placement, programmable settings, software functions and/or anticipator circuits all affect the capture and use of total latent heat of the system. Due to the "remote" placement and the monitoring configuration of the thermostat, it cannot accurately determine the demand dynamically needed due to any day’s heat loss in the system.

The TH-1 Thermostat Plus™ does not replace the thermostat; it works as an added extension with the thermostat to more effectively control the heating and delivery system. However, unlike a typical thermostat, the TH-1 Thermostat Plus™ links together and mounts directly to the supply plenum and only reacts to the actual system demand. Energy conservation is optimized to the system with TH-1 Thermostat Plus™ as it is calibrated to the specific demand sensed in each system it controls.

The TH-1 Thermostat Plus™ ad-on device is installed on the supply plenum, close to the duct distribution point. Following installation, the TH-I Thermostat Plus™ is calibrated and requires no additional attention or maintenance unless the controlled space or system is changed or modified.

TH-1 Thermostat Plus™ ad-on devices are installed by certified TomorrowHouse Systems Inc" professional installers and are approved for use with all forced air heating systems.

Conventional Heating System Operation: refer to Figure 1.

Most conventional heating systems utilize a steady-state heat exchanger. Steady state refers to a continuous and constant consumption of energy during the "ON" cycle. The heat produced, causes the heat exchanger temperature to increase until it reaches a peak equilibrium temperature (Figure I, Conventional Steady-State Heating Cycle, Heat Exchanger Temperature). Air is forced to flow across the heat exchanger. As the heat exchanger temperature increases, heat energy is transferred to the air stream; this increases the air temperature until it reaches a peak equilibrium temperature (Figure I, Conventional Steady-State Heating, Heated Air Temperature). The heated air is distributed throughout the rooms until the thermostat set point is satisfied (Figure I, Room Air Temperature).

The area between the heat exchanger temperature and the heated air temperature is the temperature. In general, as the A temperature increases, the quantity of wasted energy can also increase. This occurs, because the ratio of energy input vs. the quantity of energy transferred less efficient. A lower temperature reduces wasted energy.

The TH-I Thermostat Plus™ is designed to save energy by reducing the temperature. The controller is mounted the supply plenum and is calibrated to the heating system.

The TH-I Thermostat Plus™ reacts to the heating system BTU energy level. As the temperature increases, the controller interrupts the heat exchanger energy input until the A temperature decreases to set point. Cyclic heat exchanger energy input, based upon system BTU level, produces a lower effective temperature (Figure I, TH-I Thermostat Plus™ Controlled Heating Cycle). Effective temperature will vary depending upon the heating demand i.e. cool day vs. extremely cold day.

Overall, the majority of heating days are not extreme, therefore, a lower effective A temperature, allows the heating system to operate more efficiently. Increased efficiency saves energy and reduces annual heating energy cost.

2-STAGE / MULTI-STAGE HEATING SYSTEM OPERATION; refer to Figure 2.

2-stage and multi-stage systems attempt to compensate for the system over-sizing by incorporating two (2) or more
heating units within a single system. Stage operation is staggered; each progressive stage starts when the preceding
stage is unable to meet the heating requirement. When the area temperature rises above a stage set point, that stage shuts down; this process continues until each stage is "OFF".

One (1) TH-I Thermostat Plus™ controller is mounted to the supply plenum for each heating stage; one controller is calibrated to each stage. In operation, if the building heat requirement exceeds the 1st stage output, the 2nd stage system starts and the 1st stage TH-I Thermostat Plus™ is disabled. Stage I will operate in a steady-state mode (Figure 2, Stage I, Steady-State Heat Exchanger Temperature) and the stage 2 will cycle via the TH-I Thermostat Plus™ controller (Figure 2, Stage 2, Heat Exchanger Temperature). When the stage 2 temperature set point is achieved, stage 2 will stop; stage I TH-I Thermostat Plus™ controller is enabled and will continue to control stage I until the thermostat is satisfied.

Conventional Air Conditioning System Operation: refer to Figure 3.

Most conventional air conditioning systems are steady state. Steady state refers to a continuous and constant consumption of energy during the "ON" cycle. A compressor causes the cooling coil temperature to decrease until it reaches a minimum equilibrium temperature (Figure 3, Conventional Steady-State Cooling Cycle, Cooling Coil Temperature).

Air is forced to flow across the cooling coil. As the coil temperature decreases, heat is removed from the air stream; the air temperature decreases until it reaches a minimum equilibrium temperature (Figure 3, Conventional Steady State Cooling Cycle, Cooled Air Temperature). The cooled air is distributed throughout the rooms until the thermostat set point is satisfied (Figure 3, Room Air Temperature).

The area between the cooling coil temperature and the cooled air temperature is the A temperature. In general, as the temperature increases, the quantity of wasted energy can also increase. This occurs, because the ratio of energy input vs. the quantity of heat energy removed is less efficient. A lower A temperature reduces wasted energy.

The TH-I Thermostat Plus™ is designed to save energy by reducing the temperature. The controller is mounted the supply plenum and is calibrated to the air conditioning system.

The TH-I Thermostat Plus™ reacts to the air conditioning system BTU energy level. As the temperature increases, the controller stops the compressor until the A temperature decreases to set point. Cyclic compressor operation based upon system BTU level, results in a lower effective A temperature (Figure 3, TH-I Thermostat Plus™ Controlled Cooling Cycle). Effective temperature will vary depending upon the cooling demand i.e. hot day vs. extremely hot day.

Overall, the majority of cooling days are not extreme, therefore, a lower effective temperature, allows the air conditioning system to operate more efficiently. Increased efficiency saves energy and reduces annual cooling energy
cost.

2- STAGE / MULTI-STAGE AIR CONDITIONING SYSTEM OPERATION; refer to Figure 4.

2-stage and multi-stage systems attempt to compensate for the oversize requirement by incorporating two (2) or more air conditioning units within a single system. Stage operation is staggered; each progressive stage starts when the preceding stage is unable to meet the cooling requirement. When the area temperature drops below a stage set point, that stage shuts down; this process continues until each stage is "OFF".

One (1) TH-I Thermostat Plus™ controller is mounted the supply plenum for each air conditioning stage each; one controller is calibrated to each heating stage. In operation, if the building air conditioning requirement exceeds the 1st stage output, the 2nd stage system starts and the 1st stage TH-I Thermostat Plus™ is disabled. Stage I will operate in a steady-state mode (Figure 4, Stage I, Steady-State Cooling Coil Temperature) and stage 2 will cycle via the TH-I Thermostat Plus™ controller (Figure 4, Stage 2, TH-I Thermostat Plus™ Cooling Coil Temperature). When the stage 2 temperature set point is achieved stage 2 will stop; stage I TH-I Thermostat Plus™ controller is enabled and will continue to control stage I operate until the thermostat is satisfied.