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In some embodiments, an apparatus includes a tool to operate downhole. The tool includes a heater. The tool also includes a cooler. The tool includes a controller to control allocation of power between the heater and the cooler based on a temperature downhole, power usage, a time delay or a pressure

In some embodiments, an apparatus includes a tool to operate downhole. The tool includes a heater. The tool also includes a cooler. The tool includes a controller to control allocation of power between the heater and the cooler based on a temperature downhole, power usage, a time delay or a pressure downhole.

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What is claimed is: 1. An apparatus comprising: a tool for a downhole operation, the tool including, a first component operable at a temperature that is at or above 120 degrees Celsius; a heater thermally coupled to the first component, wherein the heater is operable to raise the temperature of the

What is claimed is: 1. An apparatus comprising: a tool for a downhole operation, the tool including, a first component operable at a temperature that is at or above 120 degrees Celsius; a heater thermally coupled to the first component, wherein the heater is operable to raise the temperature of the first component such that the first component is operable; a second component coupled to the first component, the second component not operable at a temperature that is at or above 150 degrees Celsius and is operable at a temperature at or below 100 degree Celsius; a cooler thermally coupled to the second component, wherein the cooler is operable to lower the temperature of the second component such that the second component is operable; a power source operable to generate power; and a controller to control allocation of the power between the cooler and the heater based on an ambient temperature. 2. The apparatus of claim 1, wherein the second component is an electrical component that is part of electronics housed in a thermal insulator at least partially surrounding the second component, wherein the power source is to power, at least in part, the second component. 3. The apparatus of claim 1, wherein the first component is operable at a temperature temperature at or above 175 degrees Celsius. 4. The apparatus of claim 1, wherein the second component is operable at a temperature at or below 125 degrees Celsius. 5. The apparatus of claim 1, wherein the second component is operable at a temperature at or below 80 degrees Celsius. 6. The apparatus of claim 1, wherein the first component is operable at a temperature above 175 degrees Celsius. 7. The apparatus of claim 1, wherein the first component comprises a rechargeable energy storage device. 8. The apparatus of claim 1, wherein the tool further comprises a heat sink coupled to the heater, the heat sink comprising a phase change material. 9. The apparatus of claim 8, wherein the heat sink comprises multiple phase change materials. 10. The apparatus of claim 9, wherein the controller is operable to allocate more power to the heater after a change of phase of a first phase change material and a second phase change material of the multiple phase change materials. 11. A method comprising: drilling a borehole using a drill sting for recovery of hydrocarbons, wherein the drill string comprises a downhole tool; monitoring a parameter downhole with a sensor that is within a first part of the downhole tool, the sensor is operable at or above 150 degrees Celsius; processing, by a processor, of data that is a result of the monitoring of the parameter downhole, wherein the processor is within a second part of the downhole tool and having an operating temperature at or below 100 degrees Celsius; determining an ambient temperature of the downhole tool; and allocating power, by a power source, between a cooler for maintaining a temperature of the processor at the operating temperature and a heater for maintaining a temperature of a rechargeable storage device at an operating temperature. 12. The method of claim 11, comprising powering, by the power source, the sensor. 13. The method of claim 11, wherein the power source is selected from the group consisting of a flow-driven generator, a nuclear power source, a chemical engine and a heat engine. 14. The method of claim 11, wherein the sensor and the power source are operable at or above 175 degrees Celsius. 15. The method of claim 11, wherein the processor is operable at or below at or below 100 degrees Celsius. 16. The method of claim 11, wherein the tool comprises a heat sink coupled to the heater, the heat sink having a phase change material. 17. The method of claim 16, wherein the heat sink comprises multiple phase change materials. 18. The method of claim 17, further comprising using the controller to allocate power between the heater and cooler, based on a temperature of the phase change materials. 19. The method of claim 17, further comprising using the controller to allocate more power to the heater after a change of phase of a first phase change material of the multiple phase change materials.