SCIENTIFIC OBJECTIVES: THE PRIMARY OBJECTIVE OF THIS STUDY IS TO CONSTRAIN SOURCES AND MAGNITUDES OF NON-GEOTHERMAL HEAT FLUX OBSERVED BY THE INSIGHT HEAT FLOW AND PHYSICAL PROPERTIES PROBE (HP3) INSTRUMENT. HP3 WILL MEASURE A THERMAL GRADIENT RESULTING FROM MANY FACTORS WHICH ARE UNFORTUNATELY NOT PART OF THE TARGETED GEOTHERMAL HEAT PRODUCTION (HEAT FROM COLUMN ABUNDANCE OF RADIOGENIC MATERIALS AND MANTLE ACTIVITY). TO CONSTRAIN THESE WE WILL MODEL: 1) SMALL LANDER-SCALE SHADOWING THAT WILL CHANGE SHALLOW GRADIENT MEASUREMENTS. 2) LARGE REGIONAL-SCALE FOCUSING AND CRUSTAL THICKNESS VARIATIONS THAT CAN DRIVE LATERAL HEAT FLUX. 3) PHENOMENON AT SEASONAL OR MISSION TIMESCALES SUCH AS DUST REMOVAL FROM LANDING THAT CAUSE APPARENT HEAT FLUX CHANGES. 4) LONG TERM (OBLIQUITY CHANGE TIMESCALE) SURFACE TEMPERATURE CHANGES CAN STORE PAST HEAT FAR BELOW THE SURFACE APPEARING AS FALSE GEOTHERMAL SOURCES. METHODOLOGY: WE HAVE CONSTRUCTED SEVERAL SELF-CONSISTENT THERMAL MODELS OF THE INSIGHT LANDER GLOBAL MARS AND ELYSIUM REGION THAT WILL BE CAPABLE OF ESTIMATING THE SOURCES OF HEAT FLUX MEASURED BY HP3. THESE MODELS HAVE BEEN VETTED BY THE INSIGHT TEAM OVER SEVERAL YEARS AS A TEAM COLLABORATOR AND SOME MODEL RESULTS ARE CURRENTLY IN USE FOR THE ISSWG DECISION PROCESS. WE WOULD LIKE TO EXPAND ON THESE TOOLS FOR USE IN INSTRUMENT DEPLOYMENT AND FULLY DEVELOP THEM FOR HP3 DATA ANALYSIS.