<prompt> Human: Currently we have enough cash to cover a years worth of expenses. I feel like maybe some of it could be used in investing. Is that too much money to keep in an emergency fund?  <response>: It all depends on your level of comfort. If you lost your job, how quickly could you replace that income? How screwed would you be if your furnace broke tomorrow? You need to determine how comfortable you are with your level of risk and size your emergency fund accordingly. 