The significant impact of stability on the economic feasibility of sorbents is evident from the wide variation in cost observed with different degradation rates, as shown in Fig. . Using experimentally measured heats of adsorption and working capacities (Fig. ), we estimated the DAC levelized cost of CO2 capture for each sorbent (Fig. ). Without considering stability differences, the LCOC of the HP-modified sorbents ($325 -395 / t-CO2) surpasses that of the unmodified PEI ($315 /t-CO2). The cost difference is primarily attributed to the reduced working capacity of the functionalized samples, which necessitates more sorbent for capturing the same amount of CO2, consequently increasing the sensible heat (light blue bar). The lower heat of adsorption of the modified samples does reduce the latent heat (red bar), but it is not enough to overcome the consequences of the reduced working capacity.