Edit - You asked about funerals, not laying in state. I missed that. Reps usually don't get large funerals because there are hundreds of them, and usually if they have distinguished themselves in some way they would likely be higher than a rep. There are exceptions though - Elijah Cummings being the latest one I can recall.
Also, in the House everyone is up for reelection every 2 years. In the Senate it is every 6. That really means Senators have to defend their seats much less often - especially because it is usually harder to just go straight to the Senate unless you are an "insider". Senators are usually in office much longer than Representatives (except for people like Pelosi). They have more of a chance to do something than Reps do. Plus if you look at that link above you will see most of the Senators on that list were also Representatives - so they have even more time in office.
Why don't congressmen get huge funerals ? Only senators do? There's been several congressmen that have died in the past 6 years.
They can, and have. The family has to want it, and I think CONgress has to authorize it. It looks like Presidents don't need authorization though.
https://history.house.gov/Institution/Lie-In-State/Lie-In-State/
Edit - You asked about funerals, not laying in state. I missed that. Reps usually don't get large funerals because there are hundreds of them, and usually if they have distinguished themselves in some way they would likely be higher than a rep. There are exceptions though - Elijah Cummings being the latest one I can recall.
Also, in the House everyone is up for reelection every 2 years. In the Senate it is every 6. That really means Senators have to defend their seats much less often - especially because it is usually harder to just go straight to the Senate unless you are an "insider". Senators are usually in office much longer than Representatives (except for people like Pelosi). They have more of a chance to do something than Reps do. Plus if you look at that link above you will see most of the Senators on that list were also Representatives - so they have even more time in office.